* Backend selection *
AMIDI-Plug works with backends, in a modular fashion; here you should select your backend; that is, the way MIDI events are going to be handled and played.
If you have a hardware synthesizer on your audio card, and ALSA supports it, you'll want to use the ALSA backend. It can also be used with anything that provides an interface to the ALSA sequencer, including software synths or external devices.
If you want to rely on a software synthesizer and/or want to pipe audio into effect and output plugins of the player you'll want to use the good FluidSynth backend.
Press the info button to read specific information about each backend.