It is a desktop application I am building for musicians, keyboard players, MIDI collectors and digital music archivists who have large or messy MIDI/KAR collections.

The goal is simple: make old MIDI archives usable again.

Current focus areas include:

indexing large .mid, .midi and .kar collections

searching and filtering files

listening to files while reviewing them

organizing files into a cleaner library structure

preserving older keyboard, karaoke and floppy-era MIDI archives

I am especially interested in feedback from people who still use, collect, repair, archive or maintain MIDI files and older keyboard song libraries.

I would be very interested to hear what features or workflows would be most useful to other MIDI users and archivists.

One thing I keep running into is how differently the MIDI community uses transcription output. Some people want note-perfect MIDI for sheet music generation, others want something that captures the performance feel even at the cost of some accuracy, and others are piping it straight into a DAW where timing quantization matters more than dynamics.

Curious what this community's experience has been: what's the most frustrating gap you've hit between what audio-to-MIDI tools produce today and what you actually need the output to do? And which instrument has felt most underserved?

Taking debouncing aside and velocity, a diode matrix scan of 4 rows by 8 columns requires some logic to maintain the pressed notes, that is, once the key event occurs, the note got to be played. Some bookkeeping has to be made, reflecting the fact that it has to be remembered that it had been played. As soon as it disappears from the scan balance, it got to be muted and taken out of the momentarily active notes. etc. etc.

Is this bookkeeping algorithm available somewhere? I'm aware, that reflecting velocity adds some level of complexity.

90    22    7F    1  Bb 1 Note On
80    22    40    1  Bb 1 Note Off

Another one (FATAR 49 keyboard) sends:

90    2B    72    1  G  2 Note On               
90    2B    00    1  G  2 Note Off   

What can be said in favor of the one or the other method?

I am looking for testers for com.gsequencer.GSequencer versatile audio and MIDI sequencer. 

<a title="GSequencer TestFlight" href=" removed link " target="_blank" rel="noopener">com.gsequencer.GSequencer TestFlight on macOS

It allows you to play, capture and create music. There is a piano roll, automation, wave form and tempo editor. Add your MIDI keyboard in preferences and connect it to a synthesizer. Optionally map synthesizer controls to MIDI control change messages. Click play.

Note in synthesizer's context menu "properties" you might want to change format from "single precision float" to "signed 16 bit integer" in order to achieve better real-time behavior.

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regards, Joël

• complete list of changes;
• NuGet package (full | nativeless);
• documentation.

Thanks for using the library and making it better!