Internal Oscillator; Advanced Topics; Calibration Procedure; Firmware Update Procedure - Mutable Instruments Warps User Manual

Crossfade. The carrier and modulator are crossfaded into each other, using a constant-power law. TIMBRE controls the crossfading position -
both signals are equally mixed at 12 o'clock.
Crossfolding. The carrier and modulator are summed, a tiny bit of cross-modulation product is added to spice things up, and the resulting signal
is sent to a wavefolder the amount of which is controlled by TIMBRE.
Diode ring-modulation. The carrier and modulator are crudely multiplied, using a digital model of a diode ring-modulator. TIMBRE post-
processes the resulting signal with a variable amount of gain (and emulated diode clipping).
Digital ring-modulation. A gentler version of the previous algorithm which uses a proper multiplication operation in the digital domain, which will
sound more similar to all the AD633-based analog ring-modulators out there! TIMBRE post-processes the signal with a gain boost and soft-
clipping.
XOR modulation. Both carrier and modulator are converted to 16-bit integers, and the two resulting numbers are XOR'ed bit by bit. TIMBRE
controls which bits are XOR'ed together.
Comparison and rectification. A handful of signals are synthesized through comparison operations ("replace the negative portion of the carrier's
signal by the modulator", "if the absolute value of the carrier is greater than the absolute value of the modulator, output the modulator else the
carrier"...). TIMBRE morphs through these signals (some of which having an octave pedal flavor).
Vocoder. A classic implementation of an analog vocoder, with a bank of 20 analysis and 20 synthesis third-octave 48dB filters. The modulator
sub-band signals are processed by envelope followers from which are derived the gains of each of the carrier sub-band signals. TIMBRE warps
the connections between the modulator's envelope followers and the carrier's gain elements - effectively shifting up or down the formants
extracted from the modulator signal.
As the ALGORITHM knob is turned clockwise, the release time of the envelope followers is increased.
By turning the knob fully clockwise, the modulator signal is frozen. The carrier is filtered by whichever formants were present in the modulator
signal before the knob reached this position.

INTERNAL OSCILLATOR

Press the INT. OSC button (C) to enable the internal oscillator or select its waveform. Because cross-modulation algorithms work best with
harmonically simple signals, while vocoders work better with harmonically rich signals, the available waveforms are different: sine, triangle and
sawtooth for the former, and sawtooth, pulse and low-pass filtered noise for the later.
Some of the inputs, outputs or controls operate differently when the internal oscillator is enabled:
The LEVEL knob (D) and CV input (1) control the internal oscillator frequency.
The Carrier audio input (5) phase-modulates the internal oscillator, or feeds an external source of noise into the low-pass filter.
The AUX output (8) contains the signal generated by the internal oscillator.

ADVANCED TOPICS

Calibration procedure

The module is factory-calibrated using precision voltage sources. Follow this procedure only if you want to compensate for
inaccuracies in your CV sources, or if your module has lost its calibration settings following a fault or the installation of alternative
firmware.
To calibrate the unit:
1. Disconnect all CV inputs.
2. Hold the INT. OSC button for five seconds until the ALGORITHM knob blinks in turquoise and the oscillator state LED blinks in yellow.
3. Connect a patch cable to the LEVEL 2 CV input. Leave the other end of the cable unplugged.
4. Connect the CV output of a well-calibrated keyboard interface or MIDI-CV converter to the LEVEL 1 CV input.
5. Play a C2 note, or send a 1V voltage from your CV source.
6. Press the INT. OSC button. The ALGORITHM knob blinks in fuchsia.
7. Play a C4 note, or send a 3V voltage from your CV source.
8. Press the INT. OSC button.
9. Calibration is done!

Firmware update procedure

Unplug all CV inputs/outputs from the module. Connect the output of your audio interface/sound card to the Carrier audio input (5) input.
Power on your modular system with the INT. OSC (C) push-button pressed. The INT. OSC LED will blink in orange.
Make sure that no additional sound (such as email notification sounds, background music etc.) from your computer will be played during the
procedure. Make sure that your speakers/monitors are not connected to your audio interface - the noises emitted during the procedure are
aggressive and can harm your hearing. On non-studio audio equipment (for example the line output from a desktop computer), you might have
to turn up the volume to the maximum.