John's Organ Works |
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MIDI Keyboard Stack Comparison
| M SERIES | U SERIES | |
| Minimum cost |  | |
| "Diving board" key shape | | |
| Better quality pistons | | |
| Closer keyboard spacing | | |
| Expression pedal sockets | | |
| Auxiliary piston ports | | |
| Profiled cheeks | | |
| Available without cheeks | |