ModFX: parametric analog modulation effects

A dataset of input/output paired audio signals of three guitar modulation effects pedals:

• Boss BF-2 Flanger
• Marshall SV-1 Chorus
• EHX Smallstone Phaser

The file naming convention for the output signals is

<pedal name>_<control knob positions>-<created timestamp>.wav

e.g.

bf2_0_0.5_0.5_0-250807_1308.wav

is the BF-2 Flanger output with control knob positions: Manual=0; Rate=0.5; Depth=0.5; Resonance=0 (where 0 is minimum and 1 is the maximum).

Input/dry signals

The signal input_250807_104006.wav consists of a series of short frames of pulses, chirps, noise bursts and guitar/bass playing, concatenated into a single wav file. These sub-signals are parameterised in terms of:

• Pulse shape: triangular kernel (tri), linear-group-delay chirp (lin_chirp), logarithmic-group-delay chirp (log_chirp), or the chirp that is the impulse response of cascaded all-pass filters (ap_chirp). 
• Frame length, n_win: the total length of each frame, including zero-padding.
• pulse_frac (4, 2 or 1): the divisor of the frame length that gives the pulse length. The pulse length in sample is given by n_win/pulse_frac; the zero-padding length is therefore n_win - n_win/pulse_frac.

See ModFX_illustration.pdf for an illustration.

The file input_250807_104006_cfg.csv contains timestamps of where each sub-signal starts and ends. Each sub-signal is of length 2^20 samples (23.7s at 44.1kHz).

Two input files are provided:

BF-2 Flanger recordings

SV-1 Chorus recordings

Smallstone Phaser recordings