MATRIXSYNTH-B: 10/10/09

Analogue Solutions SQ8 CV / Gate Sequencer

via this auction
"Analogue sequencers allow you to program a set of voltages and Trigger events (8 in this case), and allow you to step through them by using a clock signal or LFO square wave. With each step, then next voltage as set by the control is present at the CV output. This way repeating melodic lines can be produces. The sequencer need not control pitch, it could be used to change the filter cut-off, volume, or LFO speed.

The advantage analogue sequencers have over hardware sequencers is firstly their immediacy. Having all the controls, switches and sockets in front of you allows quicker programming. Secondly, as the output is an analogue control voltage and not a digital MIDI signal, the output of analogue sequencers can easly be mixed with other voltages, or processed in some way.

The SQ8 is a single channel sequencer with 8 steps. As it is single channel, larger sequencing systems can be built up by doubling up on sequencers. As they are all separate, you can clock them at different speeds or clock divide ratios.

Inputs:
Reset In
Clock In

Outputs:
CV Range 0-5V /10V
Gate
Step b1 Out
Clock Through

Power:
+/-12V, +5V

Controls:
8 x CV knobs
with integral Gate switch
Range Switch
Step Button

Indicators:
8x Step LED's

Size:
18HP

The SQ8 requires +5v power"

PAIA 9700 Modular Synthesizer

via this auction
"The PAiA 9700 Series takes a decidedly high level, systems approach to Synthesizer Module design. Rather than individual elements such as a single VCO, VCA or Envelope Generator, each PAiA module combines multiple elements and a powerful patch-over hardwired normaling scheme behind a single compact panel. Common synth voices can be realized with few patch cords but elements can also be accessed individually for maximum versatility in creating complex, unique timbres. A lot of synth power gets packed into a small space at a low cost. Even a "small" system of only four modules, such as the P9700S, provides the sound generating power of as many as 15 conventional modules, including: 2 VCOs 2 VCFs 2 VCAs 1 Balanced Modulator 1 Noise source 2 AR Envelope Generators 1 ADSR Envelope Generator MIDI to CV Converter Glide Processor CV Scale/Offset Processor Power Supply System level design also improves performance and lowers cost. Local voltage regulation and Star grounding on and between modules means a low noise floor and no parasitic modulations or interactions such as oscillator locking. Distributing costs like circuit boards, panels and power connectors across multiple elements dramatically lowers per element cost. All modules are scaled for 1Volt/octave Control Voltages with standard 100k ohm input impedance. Nominal signal level is approximately +10dB. Modules are designed for ±18V. unregulated bipolar power but ±15V. regulated supplies can also be used. FracRak accessory kits have heavy duty 1/8" black anodized and screen printed aluminum panels that are 2U high (5-1/4") and provide 1/8" phone jacks for patching."

Sequential Circuits Prophet 600 Analog Synthesizer

via this auction

Roland GR-700 Analog Aynthesizer

via this auction
"The GR-700 is classic Roland analog synthesizer technology. Released in late 1984, the GR-700 is the pinnacle of early Roland guitar synthesizer design. The distinctive and futuristic GR-700 features both a digital CPU for guitar tracking and a warm, fat hybrid digital/analog synthesizer engine for lush sounds. The GR-700 has a MIDI out port for controlling other MIDI modules"

AKAI AX73 ANALOG KEYBOARD

via this auction
"The AX-73 is a surprisingly good analog synthesizer that is still considered to be widely underrated and deserving of some recognition. It's a six voice analog synthesizer with an almost identical architecture to Akai's AX-60 keyboard. It also came in a rack-mount form as the VX-90. It has one oscillator (VCO) per voice and allows for 3 playing modes: Poly mode uses one VCO per voice for six voice polyphonic pads, chords and strings. Dual-VCO mode stacks 2 VCOs per voice for a thicker three-voice sound. Unison mode stacks all six VCOs onto one monophonic voice for a screamin' lead!

The AX-73 has a simple 24 dB/oct VCF filter and it has an interesting feature that allows the cutoff to be modulated by the VCO. It also has a flexible LFO with many variable waveforms, chorus, portamento, and a standard ADSR VCA envelope generator. But unlike many other analog synths, this machine is MIDI equipped for easy integration and use in today's modern studios. The sounds are quite nice and are adequate for use in any style of music production. It also had special inputs for use with Akai's S-612,