@modplayjs/dsp-softmixer

libxmp-parity software mixer DSP plugin for @modplayjs/core — the reference mixer used for S3M/XM/IT playback (and the verification target for the whole library).

Install

npm install @modplayjs/dsp-softmixer

Usage

import { CorePlayer } from '@modplayjs/core';
import { createSoftMixerPlugin } from '@modplayjs/dsp-softmixer';

const core = new CorePlayer();
core.registries.registerDsp(createSoftMixerPlugin());
core.setDsp('softmixer');

What it ports (mixer.c, mix_all.c)

• Nearest / linear / spline interpolation
• Per-voice 16.16 fixed-point position advance, per-chunk commit
• Amiga LED lowpass filter (IT FILTER quirk) with per-channel biquad
• Anticlick: per-note discharge ramp + queued-swap hot-swap
• Bidirectional loops with IT's one-sample ping-pong shortening
• Muted-channel handling, sample hot-swap (ProTracker queue), VOICE_REVERSE
• IT master volume scaling (mvol/mvolbase), 16-bit sample scaling

An optional A500 LED-filter profile (LIBXMP_PAULA_SIMULATOR parity) is available for MOD playback. For cycle-counted Amiga Paula emulation use @modplayjs/dsp-paula instead.

Part of the modplayjs monorepo. BSD-3-Clause.