ALSA MIDI Filter (AMF) Icon


A MIDI filter that uses the ALSA MIDI libraries

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The ALSA MIDI filter application runs as an ALSA MIDI client that can receive input from a source (such as a sound card hooked up to a MIDI keyboard), perform various filtering and other functionality based on the type and content of the MIDI input, and send the result to one or more other MIDI clients.

ALSA MIDI Filter (AMF) Web Site


  • program-change - From note event where patch number is determined by the pitch value.
  • bank-select - switch to the next/previous bank.
  • transpositions - Transpose pitches within a certain configured range up or down by a specified number of half steps.
  • External commands.
  • Real-time START, STOP, and CONTINUE messages.
  • MIDI machine control messages.
  • Trigger a mode (which I call "program-change sample mode") in which midifilter cycles through the entire range of patches, with a pause in between each patch. In other words, it sends patch 0, pauses for a configured number of seconds, sends patch 1, etc., until it has reached patch 127. This allows the user to try out - "sample" - each patch of the current bank without having to explicitly invoke a program change.


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