Ge0sync Synth

TB-Valhalla – 303 Desktop

The TB-Valhalla combines the modules available in the TB- range of eurorack modules into a single stand-alone desktop synthesiser.

Not just another 303 clone, the TB-Valhalla gives you two 303 oscillators, each with the usual features available in the TB-O module. So four waveform outputs, PW and PWM on the square and FM.

Built into the top right hand corner of the synth is a mini pre-filter mixer. This allows you to select to mix either both square or both sawtooth waveforms (with their own gain control) and add either white or pink noise before sending the audio on to the classic 303 resonant filter.

Speaking of the filter its the same as you will find in the best selling TB-EFA module. So everything you’d expect to find in a 303 filter – resonance, cutoff, decay and accent. The TB-Valhalla maintains the additional drive, width and chirp controls, and the filter cutoff itself can be CV controlled.

The accent can be triggered by your sequencer, or get some rythmic accent using the in built LFO to add semi-repeating accents.

Modulation wise you can use the LFO to modulate any of the CV inputs in the VCO and VCF sections.

Why not try some Ring-modulation too, the synth adds the ability to ring-mod two of the audio sources, or bring in other signals from your setup.

Rounding off the module, a four input one output buffered mixer lets you bypass the default VCO mixer to use combinations of saw,square,triangle and that strange STS waveform, and of course the noise.

On the right hand side we have the CV inputs to control the note (V/Oct) and gate for the envelope and VCA in the filter. Below that you have two passive multiples to duplicating signals.

Hardwired for instant sound.

The synth is semi-modular, that is if you just plug in a CV and gate signal you will get a fixed path output from the eurorack level filter output or 1/4″ rear line level audio outputs.

The signal flow is shown for reference on the front panel.

All hard wired paths make use of the switching path on the jacks, so as soon as you plug in a cable to one of the inputs the default signal path is cut and you are now building your own custom patch.

The default signal flows are :

V/Oct input -> VCO1 and VCO2 V/Oct input

Gate input -> VCF gate input

VCO1 and 2 saw -> VCO Mixer (with switch in saw position)

VCO1 and 2 square -> VCO Mixer (with switch in square position)

Pink and white noise -> VCO Mixer (selectable by switch)

VCO mixer output -> VCF audio input

LFO output -> VCO1 and VCO2 PWM input

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