The RS-70 seems to be the ideal keyboard for you.
The last Roland synth I had(excluding arrangers) was a Jupiter-8, which I sold several years ago.
No Midi(although there was a retrofit available)no velocity, after-touch, and only 8 note poly at max, but it had a sound that the newer synths can only dream about.
It had a terrific arpeggiator as well, although a bit basic by today's standards.
Roland always did the the synth thingy in great style.
Ian
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Remember to leave good news alone.
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.