CherryTracker

A playback-only Amiga-style module player written in Red/View, using libxmp to decode modules and SDL3 for audio output. The whole gray-bevel, FlodPro-inspired UI is drawn with the Red Draw dialect in a resizable window.

Features

• Plays MOD / XM / S3M / IT / … — every format libxmp supports, up to 64 channels.

• Spectrum analyzer — a real frequency display: 48 log-spaced Goertzel bands (55 Hz–12 kHz) over the Hann-windowed output PCM, colour-by-height bars with slow-falling peak caps.

• Per-channel VU meters — smooth gradient bars with fast-attack/slow-decay ballistics and palette-style side bezels. Classic soundtracker look.

• Scrolling pattern grid — row gutter, blue PT-style note/instrument/effect columns, highlighted current row.

• Full transport — play / pause / stop / loop, position spinners, seek slider, master volume.

• Song info — name, file + size, tracker type, channels, patterns, instruments, samples, tempo, speed, elapsed / remaining / total time.

• Sample-accurate audio↔visual sync — a snapshot FIFO keyed on bytes-played surfaces exactly the frame that is audible right now, so the meters and pattern never lead the sound even with audio buffered ahead.

• Resizable & maximizable — drag any edge or maximize; the all-vector UI keeps its 4:3 aspect, scaling crisply and centering with matching gray margins (no stretching, no blur).

Run

CherryTracker.exe                   # opens; click LOAD to choose a module
CherryTracker.exe path\to\song.mod  # auto-load and play (also works as "open with")

The shipped CherryTracker.exe is the static release build — fully self-contained, no DLLs needed. A handful of classic modules is included in mods/.

Build

Download the latest toolchain binary ("Automates builds" section), rename it to redc and drop it in the repo.

Windows:

redc -r -s -t Windows -o CherryTracker.exe player.red

Linux:

./redc -r -s -t Linux-GTK -o CherryTracker player.red

For Linux, ensure that you have the 32-bit dependencies installed (see the bottom of the Download page). Also if running it from WSL, add the pulseaudio 32-bit lib:

sudo apt install pulseaudio:i386

Prebuilt statically linked binaries for Windows and Linux available in builds/.

x86 dependencies for compilation (prebuilt versions available in libs/):

• libxmp — upstream
• SDL3 — upstream

Layout

file	role
player.red	the app — FFI bindings, routine! bridges, snapshot-FIFO sync, the Draw renderer + View loop
xmp.reds	Red/System binding for libxmp (offset-based xmp_frame_info / xmp_module accessors)
audio.reds	slim SDL3 audio-stream output (manual-feed, S16 / 2ch / 44100)
cherry.ico	application icon (embedded via the Red Icon: header field)

Credits

• libxmp © Claudio Matsuoka & Hipolito Carraro Jr — MIT license.
• SDL3 — zlib license.
• UI layout inspired by FlodPro (Christian Corti's Flod replay core, ProTracker interface published by Photon Storm).
• Test modules courtesy of The Mod Archive.

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Made with ❤️ using Red and Claude Code.