Yamaha DS55

via this auction
" * It's a second-generation 4 Operator FM synthesizer.
* It has 61 full size, velocity sensitive keys.
* It's closest relatives are probably the DX11, V50, and DSR-2000.
* It has MIDI in, out, and thru, and is multi-timbral.
* It has 1/4" jacks for L and R output, and a separate headphone output.
* Also has volume pedal, sustain, and breath controller inputs!
* Can run off batteries or the included wall-wart power supply.

The manual can be downloaded here

Now, here's where things get interesting. While it does not have full sound editing capabilities, it does have the "Quick Edit" FM editing features found on the later DX synths. It also has a simple digital delay effect, to which you can make small adjustments to the delay time. It does have patch storage, and communicates via SYSEX.

The best part: the synthesizer is patch compatible with (from what I can tell) ALL 4OP FM synths! That means you can load up the Lately Bass preset from the DX100, and have a full keyboard to play it (and a digital delay). You cannot load full libraries - only one patch at a time (there are a couple of models with full library compatibility, I believe, the DX11 being one of them). There's plenty of software on the Mac and PC to let you do this, and it wasn't too much trouble for me to use it in that fashion."

MOOG Rogue

via this auction

Roland TR-505

images via this auction

Novation A-Station

images via this auction
"British synth makers Novation take their now classic BassStation Rack to the next level. The A-Station is polyphonic, adding 8 voices of polyphony to their 1-unit rack-mount synth. Unlike the original BassStation and Super Bass Station which were real analog synths, the A-Station gets its voice architecture from the Super Nova synths, which use analog sound modelling. The A-Station has the layout and shape of the famous Bass Stations, but its guts are basically a slimmed down SuperNova.

It has 25 knobs for real-time control, and all knobs transmit MIDI controller messages. The A-Station has three oscillators which provide sawtooth, triangle, sine and pulse width modulation. There's even a simple FM synth engine which can be dialed in for sharpening the sound. Oscillators may be set to Unison or Sync'd operation and a Noise source is also included in the waveform engine. There is a nice lowpass resonant filter with switchable 12 or 24dB/oct slopes and ADSR controls. A second ADSR envelope is available for the oscillators, as well as two LFOs with sample-and-hold and MIDI sync.
On-board effects include reverb and delay. Their send levels can be controlled by the Mod wheel which is a nice effect. A 12-band vocoder is also on-board for processing external mono sounds such as drum loops or vocals. The A-Station's pads sound great when vocoded with external sounds. External sounds can also be used as an oscillator, run through the filters, envelopes, etc. with much better results than were possible on the original Bass Station. There's even a built-in Arpeggiator whose speed synchronization and sweep range can be stored with the program for instant recall. For clean analog sounding synth bass, punchy leads, pads, filter sweeps and more - the A-Station is certainly a great piece of kit to have around!"