Graoumf Tracker 2

It is a soundtracker for Windows, sequel of the famous Graoumf Tracker for Atari Falcon. This program is a integrated music sequencer and advanced sampler.The sampler uses samples files (.WAV for example) to generate sounds. It can change the pitch of the sounds to play different notes, and change some other parameters such as the volume, the stereo position of the sound (panoramic), etc.

Graoumf Tracker 2 is currently in beta version.


- 32-bit audio engine,
- Direct-To-Disk sample playback,
- Enhanced instrument features including multi-samples, filters and envelopes,
- Huge number of commands and effects for score control,
- High quality off-line audio rendering using up to 512-point sinc interpolation,
-  Automatable digital audio effect network,
-  Customizable skin and keyboard,
-  ProTracker-like GUI,
-  GT2, XM, MOD, DTM, WAV, AVR and AU file format support,
-  Undo/Redo, optional file backup


A tune is made of a sequence of patterns, supporting up to 999 positions (references to a pattern), 99 tracks and a loop. Tempo can be set between 32 and 999 BPM, with a 1/1000 BPM accuracy.

There can be up to 255 different patterns. Each pattern has its own number of steps, from 1 to 256. One note, one effect and one volume command can be played simultaneously on each pattern cell. 80 score effects of 4 digits are available, including the classic FastTracker ones and many others.


The sampler uses the instrument concept. Up to 255 instruments are available. An instrument is made of one or more samples, and envelopes. Each sample can be assigned to a key range, with its own transposition for each key. An instrument has its own overall volume. An optional resonant 2-poles low-pass filter can be used on the instrument output, with velocity control. The key range is 10 octaves and a half.

It is also possible to control some instrument parameters with user-defined envelopes : pitch, balance, volume, filter cutoff frequency and filter resonance. Each envelope can have up to 64 segments, 2 loops, a LFO and a fade-out.

Each sample can be loaded in RAM or streamed from disk. Samples can be mono or stereo, 8 or 16 bits, sampling rate ranging from 2 to 240 kHz. A sample has its own panning, volume and loop information. Both forward and bidirectionnal loops are supported.

Mixing and effects

Audio digital effects are supported in a flowgraph logic. It is possible to mix any track in a track effect, thus giving the ability to chain effects in serie or parallel, to define mix sub-groups and to realize effect inserts or send. The network can be changed dynamically. Mix and digital effect parameters can be stored in presets and controlled with the score commands.

Sound Quality

Real-time sound output is at the classic 16 bit / stereo / 44.1 kHz format. The rendering use an internal 32-bit fixed-point engine : 24 bits of precision and 8 bits reserved for the headroom, giving a general dynamic range from -144 to 48 dB. Resampling use linear interpolation, which can be disabled to reduce CPU load. Sample are processed through a click-removal system to smooth the transition between two sounds cutting each other.

Off-line mixdown can benefit from an optional high quality Sinc interpolator for resampling. The program was also the first soundtracker able to export songs to 24-bit samples.

User interface

The ProTracker-like GUI allows keyboard customization along with skin support. Module files can be automatically backed up. There is a 500-level undo/redo function for pattern operations.

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