Single VCO into VCF/VCA module with ADSR modulation of filter cutoff and VCA amplitude.

Apollo Filter Test 1

Programmable Analog Monosynth

2 VCOs, VCF, VCA, LFO, 2 EGs

Sounds recorded direct with no effects. Sequences generated by the arpeggiator.

Noise floor is quite high, probably due to a couple of noisy VCAs in the signal path that need a re-design.

MonApollo Demo Track One

Pulse wave through filter with envelope modulation of cutoff

SEQUENCE BLEEPS

SEQUENCE 2

SEQUENCE 1

Prophet 600 filter test. 
First sample pair: original Z80 firmware (7 bit)
Second sample pair: AVR 8 bit ADC
Third sample pair: AVR 10 bit ADC

Prophet 600 Filter Test Z80, 8 bit, 10 bit

Sine raw

A little arpeggio sequence with the Yusynth VCO and 4072 Arp VCF (no compensation at high resonance) with Modcan ADSR and VCA. Pulse with pulse width modulation starting at about 2:00.  A bit of envelope mod to the filter cutoff too.  Download for better quality.

Yusynth VCO and 4072 VCF Pulse with PWM

Discrete HMVCO1c and HM2040 in 2-pole topology, low pass.

HMVCO1c BCM847, HM 2-pole state variable filter

Demo 2, excessive filter noodling and some PWM.

minisystem

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