What is BASSMIDI Synth Driver?
The BASSMIDI MIDI synthesizer driver is a freeware SoundFont based Windows MIDI system driver (created by kode54 and Mudlord) for Windows XP, Windows Vista, and Windows 7. It uses the BASS and BASSMIDI audio libraries by Ian Luck (Un4seen Developments) as the SoundFont synthesizer, and includes a BASSMIDI Driver Configuration Utility, as well as a SoundFont Packer Utility.
Replaced by https://github.com/KeppySoftware/OmniMIDI
BASSMIDI Synth Driver Screenshots
BASSMIDI Synth Driver information
Comments and Reviews
Said about BASSMIDI Synth Driver as an alternative
You can use this to make midi output sound good, with the right soundfont ( I recommend "FluidR3 GM.SF2" ).