aseqdump
Display MIDI events from ALSA sequencer ports
TLDR
Dump MIDI events from all sources
$ aseqdump
Dump from specific port$ aseqdump -p [hw:1,0]
List available ports$ aseqdump -l
SYNOPSIS
aseqdump [-p port] [-l]
DESCRIPTION
aseqdump displays MIDI events from ALSA sequencer ports in human-readable format. It's useful for debugging MIDI connections, testing keyboards, and monitoring MIDI data streams.
The output shows event type, channel, note numbers, velocity, control changes, and other MIDI message details.
PARAMETERS
-p port
Subscribe to specific MIDI port(s)-l, --list
List available sequencer ports
OUTPUT FORMAT
Shows MIDI events with:
- Source port
- Event type (note on/off, control, etc.)
- Channel number
- Data values
CAVEATS
Only displays ALSA sequencer events, not raw MIDI. Subscribe to specific ports to filter output. Events are displayed but not recorded.
HISTORY
aseqdump is part of the ALSA utilities, providing MIDI debugging capabilities since ALSA's introduction.
SEE ALSO
aconnect(1), amidi(1), arecordmidi(1)