The Soundlab was a DIY or prefab mono synth. The thing I like about this the most was the joystick; it added a great level of control and modulation to the synthesizer. This had the following modules:

Joystick.
Keyboard.
Multifunction.
Dual VCO
Dual VCA
Dual VCF
Dual VC-ASDR
LFO / S/H / Ring Modulator / Noise

According to the A to Z of Analogue Synthesizers book; there were about 250 produced.
Here is more information.