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Cynthia

Reliably play MIDI music files – MIT / Portable / Windows

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Easy to use, portable app to play midi music files on all flavours of Microsoft Windows.Brief Background - Used midi playback way back in the days of Windows 95 for some fun and entertaining apps, but as Windows progressed, it seemed their midi support (for Win32 anyway) regressed in both startup speed and reliability. Midi playback used to be near instant on Windows 95, but on later versions of Windows this was delayed to about 5-7 seconds. And reliability became somewhat patchy. This made working with midi a real headache.Cynthia was built to test and enjoy midi music once again. It's taken over a year of solid coding, recoding, testing, re-testing, and a lot more testing, and some hair pulling along the way, but finally Cynthia works pretty solidly on Windows now.Some of Cynthia's Key Features: * 25 built-in sample midis on a virtual disk - play right out-of-the box * Play Modes: Once, Repeat One, Repeat All, All Once, Random * Play ".mid", ".midi" and ".rmi" midi files in 0 and 1 formats * Realtime track data indicators, channel output volume indicators with peak hold, 128 note usage indicators * Volume Bars to display realtime average volume and bass volume levels * Use an Xbox Controller to control Cynthia's main functions * Large list capacity for handling thousands of midi files * Switch between up to 10 midi playback devices in realtime * Playback through a single midi device, or multiple simultaneous midi devices with lag and channel output support * Custom built midi playback engine for high playback stability * Custom built codebase for low-level work to GUI level * Also runs on Linux/Mac (including apple silicon) via Wine * Smart Source Code - compiles in Borland Delphi 3 and Lazarus 2 * MIT LicenseYouTube Video of Cynthia playing a midi: https://youtu.be/IDEOQUboTvQGitHub Repo: https://github.com/blaiz2023/Cynthia

HN · launched Nov 24, 2025 · 86 upvotes (top 11%) · 0 views

Niche: software synthesizers and midi tools · 119 launches, 5 in the last 7 days ▼ -64% · Explore this niche →

Category and tags

  • Media & entertainment
  • Dev tools
  • Prosumer
  • Not AI
  • Hobby / open-source project

Visit website ↗ Source listing ↗

Could you build this?

Yes A portable Windows MIDI player can be vibe-coded quickly using standard Win32 multimedia APIs (`midiOutOpen`, `midiOutStream`) or cross-platform audio libraries like tinyinst or miniaudio.

Discussion

20 comments analyzed.

Competitors mentioned: OpenMPT, Qsynth, Jack Audio, VirtualMIDISynth, OmniMIDI

Concerns raised: Linux MIDI setup complexity and unreliability, Default Windows GS Wavetable Synth poor quality, General MIDI 2 not supported, System exclusive messages not supported, Virtual machine MIDI playback distortion

Feature requests: OPL3 simulation for authentic retro sound, General MIDI 2 support, Cross-platform support, Built-in soundfont support, Roland GS and Yamaha XG extensions support

Competitors

Other products that read as similar to this one : 394 launches clear the similarity bar, closest 8 shown.

Attention rank: #60 of 395 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).

Launched 19 days after the earliest competitor.

The niche, labels, vibe code rating and competitor comparison on this page are analysis by Nicheloom. If you use them, please credit nicheloom.com. How you may use our data.