Lawrence Kesteloot has updated his online TRS-80 emulator to support ORCH-90 in stereo.
You can boot his online emulator with the distribution disk for ORCH-90 at this location:
To test it out, after you boot TRSDOS and run ORCH90 from the command line, enter: N
ENTER then 4
ENTER then N
ENTER and then G GYPSY