Introduction Thank you for purchasing the M303. The M303 is a monophonic, analogue synthesizer module. It is recommended to control the M303 with the CV In, Gate In and Accent In from the Autobot or the Bassline3. Other CV/Gate-Sequencer will work in the same way, but maybe they have not the exactly timing and groove of the TB-303 sequencer. The M303 works like the synthesizer-section of the Bassline3, with much more sound variations in your modular system, than known from any other TB-303 modifications.
Controls Tune: This sets the VCO frequency tuning. Waveform: This is to switch the waveform for the VCO output. Select between SAW and the 303-Square. VCO Mod: This sets the amount of the input signal from the VCO CV In. The input signal modulates (linear) the frequency of the VCO. VCF Mod: This sets the amount of the input signal from the VCF CV In. The input signal modulates the cutoff-frequency of the VCF. The input will work for low audio signals, too.
Inputs and Outputs CV In: Input for connection to a 1V/octave source (Autobot, Bassline3, sequencer, Midi-toCV-Interface,…). The CV In converts 1V/octave to the pitch. Slide In: Input for a 5-12 Volt gate input signal. The gate will hold the gate and the slide circuit open for the duration of the gate is high. The Slide In works as Gate In too. VCO CV In: Input for linear VCO frequency modulation. VCF In: Input to the VCF for external audio signals. The connected input signal will disconnect the VCO output.
About components The original matched transistor pairs (2SC1583, 2SC2291) and the monolithic VCA BA662A are obsolete and already sold out many years ago. There exist broker shops that still offer these types very expensive, but you cannot be sure that you will get the original parts anymore and you might get worse replacements fitted into the old SIPhousing.
Warranty The manufacturer grants a warranty of two years starting from the purchase date on the product, in accordance with the condition described here. If defects are founded within this time, then these will be repaired. Potentiometers, switches and sockets apply with this product are excluded from this regulation. The decision over the warranty claim meets the manufacturer. When determined foreign modifications or mechanical damages any warranty claim expires.