inputs Powered by external 110-230 V AC source Issues The amount of force needed to trigger aftertouch is very impractical and thus unusable on this instrument. Another point of criticism was the poor readable manual. Along with the JV series, this was also another Roland model that was plagued by the "red epoxy of death". This red epoxy was used to glue the key weights into the bottom of keys, and over time has a tendency to become viscous and leak out into the unit, harming electronics and overall playability. Roland Japan offered a recall repair on the keybed for a number of years, but has since ceased. External links Site about the U-220 U-20 HOMEPAGE (Patches, Tones, Utilities, Info, DIY's and Reference Materials) → also useful for U-220 & U-110 owners as well! Synthmania site with audio demo's Polynominal demos, manual, review and resources - U-20 Polynominal demos, manual, review and resources- U-220 U-20 owner's manual (PDF) U-220 owner's manual (PDF) References U-20 Polyphonic synthesizers Digital synthesizers