MIDI Forum

In general, when you exceed the polyphony, the oldest note gets stopped. Start one note with a distinct sound, then start 128 other notes (with diffe...

I just searched for "F0 41 10 00 00 72 12", and found a forum post that said that such a SysEx is sent when an RC-505 key is pressed. I guess 8 ident...

That SysEx looks valid. Manufacturer ID (65) is Roland; device ID is 16 = default; model ID is 0 0 114 (Boss RC-505 ???); 18 looks like data set 1; 0...

I've never used Arduinos, but I've heard that software serial has problems like that, and you should use hardware serial. Howver, the Mega 2560 appea...

This happens when a file is written for a specific synthesizer, and the settings are not made with standard MIDI messages but a SysEx parameter dump. ...

ALSA's buffer size is shown in /proc/asounc/cardX/midi0 when the device is open, and is 4 KB by default. In general, you have to assume that the sp...

MIDI itself has no concept of tracks; there are only channels. If your file has two tracks with bank selects and program changes on the same channe...

Does this happen with all software? Can you show exactly what bytes are wrong?

What happens with two identical note-ons is not defined by the MIDI specification. (The SMF specification requires that every note-on has a note-off; ...

The resulting sound depends on the synthesizer. Was this file written for a specific one? What exactly do you mean with "2 notes in a row"? Some sy...

A USB/MIDI cable is not a simple cable (with nothing but wires), but contains some chips. So strictly speaking, it is not a cable but an interface. Bu...

Yes, you need a USB/MIDI interface. It requires a microcontroller to handle the USB protocol, but this can be integrated in a large plug. The only ...

MIDI is a current loop. At the transmitter, pin 4 is connected to power, and pin 5 is switched to ground to make current flow. At the receiver, the op...

Asking here is OK. There's nothing special about legato; only the device that actually generates sounds has to decide whether two notes are near en...

Yes. But reducing the overall latency from 1.4 ms to 1.2 ms might not be worth the effort.