
De VCOb van Bubblesound Instruments is een klassieke analoge oscillator met vier waveforms. Rectangle met PWM en sawtooth overtuigen met echte vintage charme. Sinus en triangle zijn puur en vullen het geluidspalet aan met elementaire waveforms.
Het frequentiebereik is breed, waardoor het ideaal is voor lineaire of exponentiële FM, met een stabiele tracking. Verder heeft de VCOb een harde sync input en inputs en regelaars voor pulse width modulation.

Bubblesound Instruments VCObAll the features you'd expect in an HP-effective package.
Had to calibrate it upon arrival, but it proved to be an easy/quick fix. Now it tracks across 4 octaves within 3-4 cents and I'm sure I could get it better if I tried.
All the waves sound as they should, although it being a triangle core the sine wave does sound exceptionally pure. The FM tones are great, a little but less aggressive than on my spectrum vco which makes it a great addition. It does go out of tune with exponential fm quite a lot if you use it for more than 1,5 octaves with a high FM setting, but that's to be expected and probably worsened by my icky calibration.
One thing that struck me as weird: the pwm seems to invert the voltages it receives. Sending it a positive voltage 'turns the pot' to the left. Not a problem of course, but it seemed odd. Might be just my unit, don't know. The PWM itself sounds great though!