Waldorf Micro Q Keyboard Synthesizer

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"It has the same sound engine as the very expensive Q synthesizer, however, there are less controls on the front panel and polyphony is limited to 25 simultaneous notes. Also functions as a vocoder..."

There are other differences as well including the ability to morph between the two filters settings on the Q while on the microQ you can only switch between them.  Regardless, the microQ is a powerful engine and aside from the differences is essentially the same as the Q.

The following are the differences from this Sound on Sound review:

"HOW THE MICRO Q DIFFERS FROM THE Q

• No Xphorm (morph) function.
• No CV/Pedal inputs.
• No step sequencer.
• No continuous filter routing — serial or parallel switch with no 'in-between' settings.
• The second effects unit is a global effect and is the only effect with delay.

• The maximum delay time is reduced from that available on the Q.
• Dynamic voice structure can yield up to 25 voices.
• Expandable to up to 75 voices (although the hardware option to do this is not yet available).
• In Multitimbral Mode, up to five effects can be used in total, four effects for the first four parts, and one global effect with adjustable mix level in each instrument.
• No digital output."