My kids on the EuroRack modular

YouTube via machinate

Modular Synth Bassline

YouTube via boobtube356
"VCO-2RM sync patch with pitch modulation on the slave oscillator. The adsr decay and release was varied according to the pitch and emphasis from the A-161. The pitch variations were established using primarily the A160/1 with some influence from a S&H LFO mixed in. Then a four note sequence went to the master oscillator using the A-152. Then the M15 was added using a ringmod, with the same four note sequence going to the M15. Bass kick was added using the MMF-1 with M10 input. Hihat is A-117 amplitude modulated with A-143-3 square using the VCA-4MX. The signal is then level emphasized by the bass kick signal using the MX-4S."

PLL Arpeggios

"PLL (setting 1, and mid range) attempts to track a simple sequence while the master VCO is pulse width modulated in time with the beat. Bass kick is Cwejman MMF-1 sine, other percussion is Doepfer A-117 amplitude modulated by Doepfer A-143-3 square using Cwejman VCA-4MX, and level modulated by the bass kick at the MX-4S. Background sequence is a combination of LFO S&H and Doepfer A-160/1 and A-152 to the VCO-2RM and M15."
Update:

PLL Arpeggios (long version) from dougcl on Vimeo.

Modular Synth Jam

"Cwejman VCO-2RM in sync mode. OSC1 square, OSC2 square, RM out to Make Noise QMMG. PlanB M10 envelope modulates the QMMG. PlanB ASR from Doepfer A-143-3 LFO (audio rate) feeds M10 timebase, OSC1 pitch, QMMG modulation depth, and QMMG resonance."

303 Vinyl Update

full size image in via Richard Devine added to this post.

ARP Odyssey Filter Mod

via here on http://www.arpodyssey.com

"Modification for the Arp 4072/4075 filter to expand frequency response.

The four 4K7 current limiting resistors which are connected between

the exponential converter and the four discrete gain stages should

be lowered to 2K2. These are the only 4K7 resistors in the module,

so locating them shouldn't be too difficult.

Another way is to add another set of 4K7s in parallel with

the existing ones. These could be mounted on the solder side of the

board. Beware of possible shorting to other pins."

Tom Oberheim Interview - Questions Open

Mike Welch wrote in to let me know he will be setting up an exclusive interview with Tom Oberheim to be featured on MATRIXSYNTH! If you have any questions you'd like Mike to ask feel free to comment or send them in directly to mwelch at gonzaga.edu. Also, if you are an AV expert in the Bay area and would be interested in helping out, let Mike know.

Pictured: Tom's new SEM with MIDI CV - via Audiomidi where you'll find the new SEMs listed and priced.

Creating a custom EPROM for the DMX

YouTube via GoldbabySamples
"How the CustomDMX was created... http://www.goldbaby.co.nz/c..."

Making The Acetate For Vinyl Drum Machines

YouTube via GoldbabySamples
"Excuse the poor sound quality. A Low audio bit rate was used on the video I'm afraid. You can hear much better audio demos on the product page: http://www.goldbaby.co.nz/v..."

Kawai K5000R Additive "Sound Clouds"

YouTube via retrosound72

"vintage synth demo by RetroSound

Kawai K5000R Additive Synthesizer - used the additive synthesis and internal PCM waves
FX: reverb and delay (Lexicon)"

MOTM-440 VC Lowpass filter

via this auction

"MOTM-440 Description

"If you are familiar with music electronics, you have certainly heard of the SSM2040 filter chip, used in the Prophet 5 Rev. 2 synthesizer, the Voyetra 8, and other classic designs. Although the production run of this coveted chip was short-lived, the SSM2040 filter has a unique sound different from a Moog, ARP or other 4-pole lowpass filter. Why? The design used a clever discrete OTA gain cell.

The MOTM-440 offers an updated SSM2040 architecture using matched NPN/PNP pairs and features a switch that adds in a second audio feedback path to boost bass response at higher Q levels. This makes the filter "growl and rumble" even more! In addition, voltage-controlled Q allows for more flexible and unique sweeping effects. Three audio inputs and three CV inputs make the MOTM-440 the killer lowpass in your system. The internal gain structure is such that over-driving the filter is now possible (unlike the Prophet 5) to get even more nasty sounds."

- write-up from synthtech.com

MOTM-440 Electrical Specifications

The MOTM system was designed to be compatible with existing synthesizer equipment, featuring:
• 1 volt-per-octave response for control of pitch-related parameters (i.e., VCOs and filters)
• Positive-going voltage Gates (+1.5V threshold)
• Positive-going voltage triggers
• Audio levels of 10V peak-to-peak
• VCAs respond to amplitude control voltages from 0 to +5 volts
• Most modules use +/-15VDC (some modules use internal regulators). Some of the 500/600 Series use an additional +5V supply.
• Power supply connector is standard AMP MTA-156 4 position or 6-position for 500/600 Series

"The MOTM-440 is the best-sounding analog filter I have ever heard."
- Robert Rich"

CLICK FOR MORE »

YAMAHA SS 30

via this auction
"Control section running from left to right
pitch/ detune - The outer pot adjusts the overall tuning and the inner pot detunes the voices against the pitch which can produce a wonderful thickening effect ( some sources describe this synth as a duphonic/ multiphonic ,others describe it as a 4 voice polyphonic. I have a feeling it is a 4 voice polyphonic but the 4 voices are split between cello (two tones) and violin (2 tones) . It then uses divide down chips enabling all keys to be played at once)
Orchestra -Depth ( Speed 1/2 ,cello ,violin ) A great ensemble effect with 2 different effect types (speed) and the ability to separate the effect between cello and violin ( so you can have ,for example cello effect and violins dry )
Vibrato ,Delay/Depth- Very nice vibrato effect.
Sustain, Cello /Violin - sustain 1 control each for cello and violin giving again the ability to have separate amount of sustain for cello and violin sections . Very short to very long .
Keyboard split 0/1/2/3 .0 setting is no split and just the violin sound over the whole range. 1 gives a split with the lowest octave for cellos the rest strings. 2 setting gives 1 and a half octaves to the cello . 3 gives 2 octaves to the cello. The splits are indicated by a white dot above the note on the control panel
Cello ,Volume, attack/slow ,cello1/cello2 - control section for cellos giving control over attack fast/slow. Choice of 2 cello sounds.
Violin Attack/Slow, Viola/violin1/Violin2 /Volume - Same as cello control section though the volume is at the far right.
Brilliance Cello/Violin Very usable low pass filter for cello and violin."