Regroover Essential Manual

Regroover Essential Manual

The information in this document is subject to change without notice and does not represent a commitment on the part of Accusonus Inc. The software described by this document is subject to a License Agreement and may not be copied to other media. No part of this publication may be copied, reproduced or otherwise transmitted or recorded, for any purpose, without prior written permission by Accusonus Inc, hereinafter referred to as Accusonus. All product and company names are trademarks or registered trademarks of their respective owners.
Regroover Pro and Essential are covered by the following patents:
Accusonus Inc.
Lexington, Massachusetts

Welcome to Regroover!

Regroover is an Artificial-Intelligence beat machine that extends traditional music sampling. Regroover is based on accusonus' patent-pending ``advanced audio analysis'' (a3 ) technology which also powers drumatom!
Regroover's A.I. engine analyzes an audio clip and extracts the fundamental audio elements in separate tracks called Layers . Regroover allows you to reach deep within your audio clips and extract previously unreachable sound elements. For example, if your clip is a drum loop, Regroover will extract layers containing the kick, the snare and the cymbals or any combination of those that is meaningful to the A.I. engine. If you use Regroover with an ambient soundscape loop, the resulting layers will be more abstract (and perharps more interesting).
After Regroover has extracted the layers from your audio clip, it's time for you to start using them to create fresh and exciting music! You can use the layers to go beyond traditional music sampling and kickstart your inspiration. With Regroover your can:
  • Extract layers from different clips and create new, unique audio clips and loops
  • Remix and rearrange the layers to create variations of your audio clip
  • Experiment with the settings of the analysis engine to extract inspiring sound elements
Regroover is a unique beat machine and instrument that we hope will provide you with new sounds, capabilities and workflows and allow you to create more music, faster and in a very stimulating way!

Installation & activation

You can find the latest Regroover installer in your accusonus account page in the ``Downloads'' section
( ). For more information about installation and activation see the Activation Manual, which you can find along with the installer.


Your computer must have:
  • an Intel (or Intel compatible) CPU
  • a minimum of 2GB RAM memory
  • at least 250MB free space on your hard disk
  • a minimum a screen resolution of 1280x800 pixels

Supported formats

Regroover is available as a virtual instrument plug-in in the following formats:
  • AU (32/64-bit), VST (32/64-bit) for Mac OS X 10.8 to 10.11
  • AAX (64-bit) for Mac OS X 10.9 to 10.11
  • VST (32/64-bit) and AAX (64-bit) for Windows 7 (with Service Pack 1) or higher
We have tested Regroover in the following DAWs:
  • Ableton Live 9.5
  • Logic Pro 10.2
  • Steinberg Cubase 7.5 (64-bit only)
  • Avid Pro Tools 11.3 and 12.5
  • Cockos Reaper 5.22
  • Presonus Studio One 3.0
  • ImageLine FL Studio 12.0
  • Bitwig Studio 2.0
  • Propellerhead Reason 10 (Mac only)
Regroover is not supported in the following:
  • Steinberg Cubase 32-bit
  • Propellerhead Reason 10 (Windows only)

There are just too many combinations of DAWs and plug-in formats out there, so there's always something we might have not tested. If you don't see your DAW above, you can always download the free, fully-functional 14-day trial and see if Regroover is supported for yourself. If you encounter any problems, let us know at

Experience Regroover in two minutes!

You can get started with Regroover in just four steps:
  1. Import an audio clip by clicking (or by drag & drop). Regroover will automatically split your clip in layers. By default the number of layers is four.
  2. Listen to the result by clicking or by starting your HOST playback. Use the on and solo buttons to listen to any layer combination.
  3. Experiment with the number of layers using the ``Layers'' slider to change the analysis result.
  4. Remember to hit SPLIT for the change to take effect.

  5. Set the start/end , markers for each layer to start regrooving your clip and use or start your HOST playback and listen to the new loop variations in real-time.

Import and playback of audio clips

Importing an audio clip

To start using Regroover you need to import an audio clip. Regroover supports .wav, .aif/.aiff and .caf files of standard sample rates, with a maximum duration of 30 seconds. You can import an audio clip by choosing one of the following options:
  • Click on the button (available only in empty Regroover instance).
  • Drag & drop a clip directly on Regroover.
  • Select ``Load Clip'' from the drop down menu.
Once a clip is imported, Regroover will automatically split it into Layers. The Clip Info Box will display the clip's file name.

Each time you import a new clip, Regroover will clear all previous data and work you've done on the Layers. See ``Saving your work'' section for more information on saving Regroover's state and data.


When you import an audio clip, it is automatically resampled to match the DAW project's sample rate, before any processing takes place. If you wish to change the sample rate of your DAW session while working on a project, Regroover will also resample the audio clip to the new sample rate without losing any of your project information.


Regroover can sync the imported audio clip to your HOST. When you import a clip, Regroover will detect the clip's BPM. The estimated value will appear in the BPM text editor . By default, Regroover is in ``Sync'' mode which means it will automatically warp the audio clip to match the BPM of your HOST. You can edit this value, or use the x2 /2 buttons if you are not happy with the estimation.

While the ``Sync'' mode is enabled any change in the BPM estimation will warp the audio clip accordingly. Regroover treats this as a new audio clip and all your Layer edits will be cleared .

If you change the HOST BPM value, the ``SYNC'' button will start blinking. The audio clip will remain synchronized to the previous BPM of your HOST and Regroover will be unsynced to your new HOST BPM until you enable SYNC again.


The waveforms in the Layers section can be displayed over a grid, only when ``Sync'' is enabled. With the grid enabled, Layer markers and annotations snap to musical time intervals (1/4, 1/8, etc). By default, the grid is set to 1/16 resolution. You can choose the desired grid resolution or turn it off using this menu:

If the key is pressed while dragging a Layer marker or annotation, snapping is disabled.

The available grid resolutions depend on length of the imported audio clip. For longer audio clips, small grid resolutions are disabled.

Audio playback

Sync to HOST mode

With the button active, Regroover is in "Sync to HOST" mode. While
in this mode, Regroover will follow your HOST playback. Hit play in your HOST and Regroover will loop all Layers while taking into account the Layer marker positions for each layer. Note that in this mode, Layer playback stays in Sync with your HOST arrangement, and looping is based on your Pattern Length selection (see below).

Play button

Use the button to preview Regroover without starting your HOST playback. Note that in this mode, Layer playback will loop based on your Pattern Length setting.

Pattern Length

The (Pattern Length) setting allows you to define the length at which Regroover will restart the looping of your Layers playback. You can choose between:
  • Clip Length Sets the Pattern Length to be the same with your imported Clip length
  • None Loops each Layer individually, based on their markers, with no restart occurring.

Master Limiter

A Limiter has been added to the master section of Regroover to control the loudness. The switch will turn the Limiter ON or OFF, limiting the signal at 0dB before going through the master gain. A PEAK led, found next to the master gain slider, indicates when the signal becomes too hot and exceeds the 0dB threshold. Notice: The PEAK led will still indicate some clipping if the master gain is pushing the limited signal above 0dB.

Audition mode

The audition mode is helpful when you want to listen to a specific part of a Layer. Use the + (Mac) or + (Win) modifiers and click on a Layer. Regroover will playback the audio from the point you clicked to the end of the Layer, or the selected audio if you click on a selection. If you release the keyboard modifiers before the end of the layer, playback will stop. You can click on any part of any layer and playback will begin as long as you hold the modifiers.

Layer mixer section

Each layer has the following basic mixing controls:
  • ON: Turn a layer's audio track on or off.
  • Solo: Solo a layer's audio track. By default the Solo is exclusive. You can click while holding the (Mac) or (Win) modifier to Solo multiple layer tracks.
  • Solo is post fader, post pan and post mono to stereo.

  • Stereo Enhancer : Using the stereo enhancer, you can adjust the balance between the mid(M)/side(S) parts of the signal. The mid signal M is the sum of the left and right channels, which gives only the mono information of the signal and the side signal S is the difference of the two, providing the stereo information only.
  • Gain and pan : The gain slider controls the layer track's volume. The pan knob controls the stereo position.
  • The pan knob operates as a simple balance knob for stereo tracks.

  • ON: Turn a layer's audio track on or off.

Layer effects section

Regroover Essential comes with a set of effects that allows you to quickly shape the tone of each layer. It features a gate, an EQ and a compressor. The effects are bypassed by default and automatically enabled when a parameter is changed or by clicking on the on/off button.


A gate cuts the signal level whenever it falls below a threshold. Louder sounds pass through unchanged, but softer sounds, such as noise or the decay of a sustained hit, are cut off. When the gate is fully closed (no signal passes through) the GR bar should be fully illuminated.
  • Threshold : Signals that fall below this level (in db) are cut off.
  • Attack : Time it takes to fully open the gate.
  • Hold : Time the gate stays open after the signal falls below the threshold.
  • Release : Time to close the gate again.
  • Flip : Inverts the behavior of the gate. Parts of the signal that are louder than the threshold will be muted and only the lower ones will pass through the gate.


The EQ shapes the sound of incoming audio by changing the level of specific frequency bands. There is a low shelf and a high shelf filter as well as a peak with adjustable frequencies and gain settings.


By reducing the highest parts of the signal, called peaks, a compressor raises the overall level of the signal, increasing the perceived volume.
  • Threshold : The threshold control sets the level at which the compression effect is engaged. A signal will be compressed only when it passes above the threshold.
  • Ratio : The ratio of signal reduction when the threshold is crossed e.g a ratio of 2:1 indicates that a signal exceeding the threshold by 2 dB will be attenuated down to 1 dB above the threshold
  • Gain : Set the amount of gain applied to the compressed signal.
  • Auto : Turn on/off automatic gain compensation.
  • Attack : Set the time it takes for the compressor to react when the signal exceeds the threshold
  • Release : Set the time it takes for the compressor to stop reducing the signal when the signal drops below the threshold.

Split your clips in meaningful layers

Split is the operation during which Regroover analyzes the audio clip you have imported and extracts layers . The first split takes place automatically when you import a clip. You can change the resulting layers by changing the analysis parameters, using the annotation tool and performing more splits. To perform a split just hit the SPLIT button.

Analysis parameters

You can change the result of a SPLIT by using the two analysis parameters:
  • The Layers slider allows you to select the number of layers Regroover will use to split the audio clip.
  • This corresponds roughly to the number of audio elements you wish to extract from the clip. Experiment with different results by changing the value of this slider.

    Select small values for simple audio clips and higher values for more complex clips with many audio elements.

    For this change to take effect you need to click SPLIT to perform a new analysis of your audio clip.

  • You can use the Activity slider to indicate how busy your audio clip is. For most cases you can leave it at the default setting, between ``Low'' and ``High''.
  • If you have an audio clip with slowly changing material set the slider value to ``Low''. If you have a busy audio clip with many sources set the slider value to ``High''.

    For this change to take effect you need to click SPLIT to perform a new analysis of your audio clip.

Annotation tool

The annotation tool is useful if you want to edit and reshape the layers produced by Regroover. Clicking on the ``eraser'' icon activates the annotation tool. You can double click on a layer to create an annotation region . This indicates that Regroover must move all audio from that region and assign it to another layer. Note that this is not a simple ``copy/paste'' operation and will change the audio of all layers. A new split must be performed during which Regroover's A.I. engine will take all annotated regions into account and produce new layers.
You can resize annotation regions by dragging either end. You can move them around by dragging them along the layer. You can use the audition mode ( + + click for Mac + + click for Win inside an annotation region) to playback the region and make sure your selection is correct. You can delete a region by clicking anywhere inside the region while holding the modifier.

If you turn off the annotation tool, the annotations are not deleted , but Regroover will ignore them in the next split.

Locking a layer

If you are satisfied with the sound elements of a layer and you want to keep them untouched you can lock the layer by clicking on the ``lock'' icon . While a layer is locked, it cannot be annotated and any subsequent splits will not affect the audio data.

Using locked layers and annotations can help you direct Regroover's output and shape the layers to your liking.

Renaming a layer

You can rename the Layers as you wish, giving them a more meaningful name for example, by selecting a Layer and double-clicking on the Layer name

Expansion Kit

The Expansion Kit found at the bottom right corner of the Layer's Tab, serves as a way to load .regroover projects created with Regroover Pro . Each of those pads corresponds to the exact same pad of the loaded Regroover Pro project. The sounds of the pads can be triggered but cannot be edited or replaced. The label of each pad denotes the corresponding midi note that can trigger the loaded sound of the pad.

When loading a .regroover project created with Regroover Pro , the output routing for each Pad is set to Out 1.

Regroove your clips

MIDI and Layers

You can playback each layer using MIDI notes. Regroover receives MIDI note messages from the DAW or from an external MIDI controller. Each layer corresponds to the note displayed on the layer track (notes C3 through F3 for layers 1 to 6 respectively). The note labels will be activated when the corresponding MIDI note is hit. In addition, a global MIDI indication at the top of Regroover, will change state when Regroover receives MIDI input signal.

The corresponding notes for Cockos Reaper are C4 through F4. The corresponding notes for FL Studio are C5 through F5.

The Layer markers are very useful when you want to control the beginning and end point of MIDI playback for each layer. You can drag the left and right markers to select the region you want to playback using the MIDI notes. The markers for each layer are independent, but you can hold the modifier while dragging to align all corresponding markers from all layers.

MIDI and Expansion Kit

The sounds loaded in the Expansion Kit pads can be triggered using an external MIDI controller or by drawing MIDI patterns in the DAW note editor (notes C4 through D#5 for pads 1 to 16 respectively).

The corresponding notes for Cockos Reaper are C5 through D#6. The corresponding notes for FL Studio are C6 through D#7.

An important difference between Layers and Expansion Kit is velocity information. Layers ignore velocity information. Expansion Kit pads are taking velocity information into account.

MIDI Settings

Regroover allows you to choose a MIDI mode for Layers
amongst three configurations which can be found in the SETTINGS window:
  • Trigger mode triggers layer playback from the beginning to the end and stops after playback reaches the end.
  • Toggle mode toggles playback of layers. The first note on MIDI event will begin playback from the beginning and loop until another note on event is received.
  • Hold mode loops over the layer audio for as long as you hold down the corresponding note.

Layers' default MIDI mode is hold .

MIDI playback (for any mode) is affected by layer Mixer controls and Effects settings.

Saving your work

Saving a DAW project

DAW projects that contain Regroover instances contain all the required data so you can continue your work, apart from the imported audio clip.

If the location of the imported audio clip is changed, Regroover will notify you for the missing clip and will ask you to locate it.

Regroover projects

A Regroover project is a self-contained file with the .regroover extension. You can save all the required information and data from a Regroover session in such a project. The main advantage of using Regroover projects is that you can move them around from one computer to another, from one DAW to another and share them with other Regroover users.
Click on the PROJECT button of the top menu to access the project menu. Select Save project or Save project as... to save your Regroover project. Once a project is saved the project's name will appear in the PROJECT button. For your convenience, go to SETTINGS and select a default directory where all Regroover projects will be saved. Select Open project... to load a project or simply drag & drop a Regroover project file on Regroover's window

When sharing DAW projects containing Regroover, it is necessary to save and deliver the corresponding Regroover Project alongside the DAW project. In any other case when the DAW project is opened in a different environment, Regroover instance won't contain any data.