xoscope is a digital oscilloscope using input from a soundcard or
EsounD and/or a ProbeScope/osziFOX and will soon support Bitscope
hardware. Includes 8 signal displays, variable time scale, math,
memory, measurements, and file save/load.
The ALSA MIDI filter application runs as an ALSA MIDI client that can receive input from a source (such as a soundcard 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.