I never had a problem with mini-keys...used to use a Yamaha DX-100 for synth use and for vocoding (also I have a Yamaha CS-01)...however, using a midi controller with regulation sized keys, does make it much easier for some.

Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.