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The Sinkhole is perhaps our most ethereal reverb unit to date. We’ve combined a harmonically-rich “hole” reverb with an impossibly deep four-voice chorus that’s been outfitted with a feedback control and a gentle high-cut filter. Within this arrangement, the feedback control allows the Sinkhole to reach deep within the reverb to extract some truly otherworldly tunable modulation, featuring everything from comb filtering to pseudo-phaser to haunting auto-filtering.
That aspect never gets out of control; it’s all wrapped up within the confines of the reverb. We’ve stretched the reverb trails out to their absolute limit, with the maximum decay time almost freezing your signal in space. Extreme settings evoke warm synthesiser pads, reminiscent of vintage analogue-digital hybrids, holding your modulated note indefinitely.
Combine all that with a full wet-dry blend and a warm preamp circuit, and you’re beginning to feel the gravity of the Sinkhole. Let’s get pulled in, shall we?
CONTROLS
DWELL: The original Fender reverb unit’s Dwell control was basically the volume control for its tube preamp (which is very similar to the preamp in all Fender amps). So the Dwell knob sets how hard the transformer and springs are being driven. The Topanga’s Dwell knob works the same way, controlling how hard the virtual spring circuit is driven, from a very mellow reverb to the over-the-top reverb that made the original famous.MIX: Full counter-clockwise is a dry signal only, and full clockwise is a reverb signal only. Just set it to the amount of reverb you want. Do note, though, that if you hit an overdriven amp (or overdrive pedal) with the Topanga, you’ll need to set the Mix control lower to achieve the same balance. This is true for the original unit, too
TONE: Essentially, this control is a low-pass filter for the reverb signal from the spring tank. We’ve duplicated this architecture in the Topanga to give you the authentic sound. Most people run the Tone wide open, but you can back off the control to obtain mellower background reverb sounds.VOL: We’ve added the ability for you to control the overall output of the Topanga. The Volume knob controls both your dry signal’s volume and the reverb, and it affects the output gain of the discrete preamp.
POWER SUPPLY
Topanga runs from 9 to 18 volts using a standard DC centre-negative power supply for pedals. Make sure you’re using a supply that provides at least 100mA. 9 volts will sound great all around, but if you want even more output and an even healthier boost to your dry signal with increased headroom, try all the way up to 18 volts! Oh, and Topanga does not run on batteries.
