Who remembers this one from 1996? The ATC-1 was an all analog mono synth which featured a very unusual switchable plug-in filter cartridge system, giving the user the ability to instantly switch between four faithful reproductions of classic analog filters from famous machines. The plug in filter choices were:
MINI: the classic 24dB Minimoog filter.
303: the classic TB303 filter
SEM: Oberheim's 12dB Synth Module filter.
2600: ARP 2600 filter.
[ATC filter cart's]
Filters were freely interchangeable, but if you wanted access to all 4 at once without unplugging and grovelling around around the back of your rack, then you could add the rack-mount filter bank accessory for a price of £149 GBP which accepted all 4 filters which were then easily accessible on the fly at the touch of a few buttons.
The ATC-1 featured 2 Oscillators: Both, both of which could do triangle, saw, and variable pulse waveforms. Other features include: Osc' 2 can be synced to Osc' 1, Oscillator cross modulation. 3 x four stage (ADSR) envelopes. Envelope 1 and 2 control the VCF and VCA. Destinations for envelope 3 include: VCF resonance, Osc 2 pitch, Osc 2 level, Osc 1 & 2 pulse width, LFO 1 & 2 depth, LFO 2 rate, X-Mod' amount, and Noise level.
The ATC-1 has 2 LFO's who's waveforms include: Triangle, Saw up, Saw down, Square, Random, and Noise. LFO destinations are: Osc 1 & 2 pitch, Osc 1 & 2 Pulse width, Osc 2 level, X-Mod amount, VCF Cutoff frequency, VCF Resonance, Noise level, and VCA.
The ATC-1 had comprehensive Midi Implementation:
Assignable to pitch bend: Pitch, Osc 1 frequency, and/or Osc 2 frequency, VCF frequency.
Assignable to aftertouch and/or mod wheel: VCF frequency, VCF resonance, Osc 2 frequency, Osc 2 level, Osc 2 pulse width, LFO 1 & 2 depth, LFO 2 rate, X-Mod amount, and Noise level.
Assignable to velocity: Envelope 1, 2 and 3 amounts, VCF frequency, VCF resonance, Osc 2 frequency, Osc 2 level, Osc 2 pulse width, and noise level.
Also receives: Program change, glide on/off, glide time, hold, and midi volume. VCO, VCF, Envelope, and Modulation parameters accessible via fixed continuous controller assignments.
Sends: System exclusive patch info and parameter value as controller info.
Other features included: Glide and auto glide: Glide pitch from note to note, or from a chosen interval up or down. Envelope inverting: with Invert Envelopes 1 and/or 3. Multiple trigger: Re-key envelopes 1 and/or 3. Free-run control: Configure envelopes 1 and 3 to act as LFOs. Midi clock to LFO 2: Sync LFO to incoming midi clock info. Select from seven different beat divisions.
The ATC-1 also featured an audio input & CV and Gate in and out. Total memory was 512 patches in RAM.
The ATC-1 launched in 1996 for a typical price of £900 - £1000 GBP, but the price dropped within a couple of years to a very reasonable discounted price of around £599 GBP.
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