Adjustments:

Use the graphical mixer to change volume, pan, transposition for each channel
You can send each MIDI voice to a different SoundFont.
Change midi instruments
Change the tempo
Save these modifications back to a midi file

Render to wav:

Save to 16bit or 24bit stereo audio.
Built-in post-processing effects like Low Pass Filter and Reverb.

Get information:

Use the score-view to see the notes in a track.
Use the event-list to see raw MIDI events.
Use the SoundFont information tool to show the instruments within a soundfont and preview them.

release notes

bmidi to wav now supports .cfg and .pat files in addition to SoundFonts, and 
therefore gaining support for eawpats and freepats.
From Audio->Choose Soundfont...->Change... you can choose a .cfg file
In Linux, note that a cfg file in the directory /etc/timidity can take precedence.

0.9.0
    initial release
1.0.0
    more Timidity options can be configured
    big thanks to Ben Collver for a patch to use the Python version of his sfubar utility
1.1.0
    support added for older versions of Timidity, legacy cfg and pat files
1.2.0
    some UI tweaking
    several more Timidity options can be configured

features

release notes