The Elka Rhapsody is a fully polyphonic multi-orchestral synthesizer with either a 49-key or 61-key keyboard, depending on the model.

It also had a master tuning control on the rear panel of the instrument.

It had four sounds, violoncello, strings, piano and clavichord which could also be switched in and out, similar to the 490.

Each voice had separate volume and decay time sliders mounted on the top of the instrument.

The 610 had a split function, which would allow one sound - for example, bass - to be assigned to the lower half of the keyboard, while the upper section could play a different lead voice.