I use the VSTsynthfont64 mentioned above. This is an older version. Not sure how this was loaded as i never paid for it, but as Rusty mentioned it may have come in a BIAB install at some time in the past. It works great.

CoolSoft's free VirtualMIDISynth looks to be very similar to VSTSynthfont64 in that it uses soundfonts. This is freeware. Installs on PC fine, but I have not been able to install in BIAB! This may be worth figureing out.

TTS MIDI synth was a total bust. The free version has little to no sounds.

Halion Sonic - never tried this one.

BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, 1TB WD Black NVMe SSD, 2TB WDC Blue SSD, 1TB WD Blue, 2 TB SK NVMe, 6 TB External, Motu Audio Express 6x6