If you are specifically looking for the famous M1 House Organ or M1 Piano, these free plugins and tools offer similar results:
Cracks often fail to work after OS updates, and they can cause your DAW to crash mid-session. korg m1 plugin free
Compare the to the free alternatives.
The KORG Collection M1 V2 is available as a free demo version* that offers all synthesis functions for free as a trial. KORG (USA) Spitfire Audio If you are specifically looking for the famous
Korg released a free, stripped-down version called (often bundled with hardware or given away on Plugin Boutique). korg m1 plugin free
The ability to layer different sounds (like strings over piano).