by using:
Search for "Korg M1" to find free Soundfont (.sf2) files mapped directly from the hardware.
Korg sells the official, highly accurate emulation called the .
The M1 was a "rompler" (a synth based on a ROM of samples). SampleTank functions the exact same way.
Many sound designers offer free "M1 Tribute" packs containing multi-sampled versions of the Piano 16' and Organ 2 patches.