MATRIXSYNTH: Modified TAMA TECHSTAR TS305 Beats.

Tuesday, August 25, 2015

Modified TAMA TECHSTAR TS305 Beats.


Published on Aug 25, 2015 circuitbenders.co.uk

"Mods include an LFO with pulse and continuously variable saw up/triangle/saw down outputs, with a LFO range switch that takes its speed well into audio frequencies.

On each of 4 channels theres a percussion decay long/short/constant tone switch, VCO frequency modulation source switch (audio or LFO), LFO waveform switch (pulse or saw/tri), VCO FM amount knob, and a VCO pitch range hi/low switch.

The VCO frequency of each channel can be modulated either using the LFO or the output of the overall audio source selection switch. This rotary switch chooses between sourcing the audio modulation signal from the output of any of the six channels, including the channel being modulated for FM feedback loops, or an external audio input."

Update:

Modified TAMA TECHSTAR TS305 drone & cross modulation

Published on Aug 25, 2015

"On this demo the four modded channels are all set to produce a constant tone, and are then their VCO frequencies are modulated with each other and the LFO"


Update: some details on the mods via Circuitbenders where you'll find more pics & info.

"The new version of these mods is based on the previous version, but expands on version one to give more in depth control and a lot more possibilities for modulated analogue percussion weirdness.

The LFO retains the same basic design, but also provides a new range switch that selects between the normal speed settings provided by the previous mods, and a super fast speed range that takes the LFO rate well into audio frequencies for all kind of insane 1950's sci-fi frequency modulation effects. The LFO still outputs pulse and saw/triangle waveforms, but on the new mods you get a separate LFO waveform selection switch on each modded channel, instead of a single overall waveform switch that is applied to all channels simultaneously.

Each modified channel now includes:

Decay range switch: As before, this sets the range of the decay knob, but it now has three positions instead of two. With the switch set upwards the decay knob range of the percussion tones is set to normal. With it switched downwards the range of the knob is extended to take over where the normal range left off at its lowest setting, and give a lot longer decay times at maximum. With the switch in its central position the channel will output a constant VCO tone with the pitch set by the channels tune knob. Any channel with its decay switch set to the tone position can either be kicked into life with a trigger input, or if its left to its own devices the tone volume will eventually rise on its own.

LFO Shape switch: As explained above, this switch selects the VCO LFO waveform independently for each channel. The choices are pulse or saw / triangle

VCO FM Source switch: The VCO frequency of each channel can be modulated either using the LFO, or with an audio source provided by the audio source rotary switch (see below). This switch selects between the two options.

Moded Tama Techstar TS305

VCF FM Amount: This is a new knob on each channel that independently sets the amount of frequency modulation that is applied to that channels VCO. Anything from subtle vibrato or warbling Theremin like tones, to extreme cross modulation effects that wouldn't be out of place on the Forbidden Planet sound track, can be achieved using the VCO FM mod.

Tune Range switch: As before, this sets the range of the VCO tuning knob, but with some minor adjustments to give a better range and response curve than before.

modified Tama Techstar v2

The new audio source rotary switch determines where the input for the audio setting of the channel VCO FM switches is sourced from. The audio modulation signal can be sourced from the output of any channel, or an external audio input. The output of a channel can be used to modulate its own VCO frequency for some bizarre frequency modulation feedback sounds.

The audio output of each channel is sourced before the channels output volume knob, so its entirely possible to do things like setting up one channel to output a constant VCO tone, then turn down the volume on that channel, but still use the that tone to modulate the VCO frequency of other channels. Alternatively you could produce an audible percussion sound on one channel and then use a muted sound on another channel to mutate the first channels sound on accented beats, kind of like you might use a side chain input on a compressor. Use the LFO to slightly modulate the muted sound and you've got an infinite variety of evolving hits and accents."

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