It won’t completely get rid of the high frequency squelches but bring it down enough to make a difference. At 0 it’s disengaged and at 1 & 2 you get two different amounts of high frequency damping. The muffler is designed to tone down these high frequencies especially at higher levels. When the resonance parameter is set to high values the synth can produce some extreme high frequency content. None the less, distortion has always been a critical step in the bass synthesis domain so it’s good to have this built-in the system so you don’t really need to process the signal externally. I would have liked to see an option to disengage the overdrive circuitry completely and just have the clean synth sound. This is more like a true overdrive control where you’re basically overdriving the circuit by adding excessive gain. What’s also interesting is that this attack time only affects the non-accented notes. I’m not sure what the exact range is, but it is quite small. This is not the usual attack time knob you see on typical synthesizers which usually reach values of multiple seconds. On the MO version we now have control for attack time.
It made sense, this is a bass synthesizer so we don’t need to have any attack.
It may be unusual to even talk about attack on a synth like this because historically the TB-303 never had an attack control. When the filter resonance is set very high you can lose some low end so it’s good to have the option to engage the sub-oscillator. In terms of the sound, it definitely adds to the tonality to have a sub oscillator mixed along with the main tone of the synth. Though what is really nice is that you can set the main oscillator’s waveform switch to OFF and just listen to the sub. I personally would have preferred a continuous control for this so it can be gradually increased or decrease in level. On the TD-3-MO the sub-oscillator has a switch to engage it and a three position switch to set the level to low, mid or high. It is always linked to an existing oscillator and usually won’t have many independent controls. It is important to understand that a sub-oscillator is not a separate oscillator. Probably one of the features that stands out the most on the TD-3-MO versus the TD-3 is the inclusion of a sub oscillator.
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