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Show HN: Cynthia – Reliably play MIDI music files – MIT / Portable / Windows

75 pointsby blaiz2025today at 1:58 PM17 commentsview on HN

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 License

YouTube Video of Cynthia playing a midi: https://youtu.be/IDEOQUboTvQ

GitHub Repo: https://github.com/blaiz2023/Cynthia


Comments

ale42today at 2:23 PM

In the days of Electron bloatware, it's refreshing to see a program that is so light in terms of size. Unfortunately, at least on a 4K screen, the interface is a bit laggy and it uses a lot of CPU.

show 1 reply
luc_today at 2:36 PM

Finally, don't have to remember the UMRN for Camptown Races anymore.

xcf_seetantoday at 3:03 PM

It has a freepascal/lazarus project file, so it can be compiled for a lot of platforms, i don't about midi drivers on those platforms, so midi could not work or need more code.

bitwizetoday at 4:46 PM

Feature suggestion: Optional OPL3 simulation, so that CANYON.MID can be heard as God intended.

tostitoday at 2:14 PM

Calling a program portable by virtue of wine being a thing defies logic. That said, nice work. Midi instrument input is on my wishlist.

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baal80spamtoday at 2:47 PM

Type: Desktop App (Standard Edition)

This is (pun intended) music to my ears!

zahlmantoday at 4:41 PM

Wow, it's been a long time since I saw Pascal code.

mock-possumtoday at 3:58 PM

My first thought was “what’s wrong with foobar?”

Then I saw the instrument / note grid, and the keyboard UI - this looks fun!

Jeff-Collinstoday at 3:13 PM

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Joshua-Petertoday at 2:36 PM

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johndeere85today at 2:22 PM

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