Roland JU-06A Boutique Synthesizer
Connectivity for sounds in/out is by stereo miniature jacks so may need to use adapters depending on your needs.
I am using a full size 49 key midi controller keyboard, via the midi-in connector, to play it as a 4 note polyphonic synth which works fine for me and saves wear and tear on the units keypad.
Arpeggiator, choruses and delay are all useful.
Volume control on back is small.
I have not looked into the sequencer yet.