via this auction
"POWER CORD VERSION. We do not know the manufacturing date. Our best estimate is the early 1980's
Comes in original box and includes all original paperwork including warranty card (though we doubt EHX will still honor it)
EVERYTHING SYNTH
via MeeBlip:
"Curve introduced unique waveform editing and preset sharing to the world of synthesizers. Version 2 is in the making, taking its preset sharing steps further and adding more creative sound features. All this while keeping its ease of use, at an excellent sound quality.
"Here is a track featuring a Esq1 ( earlier model metal casing, sturdy and heavy as hell )