Last night, for the Halloween trick-or-treating, I decided to "go for it" and play the Dotcom modular synthesizer *live* (I usually decorate for Halloween in the "mad scientist" theme, as that's what I do for a living anyway and I have plenty of lab coats and safety goggles.).

It's an article of faith that one does NOT play modular synthesizers in real time. Even something semi-modular, like an ARP 2600, is _almost_ never played in real time (Ever hear "Frankenstein" by Edgar Winter? That's an ARP 2600. But it took a roadie half an hour to preset the 2600 for the crazy solo, and another ten minutes afterward to make it "right again" afterwards.)

I went "true modular". No keyboard, just patching and knobbing, in real time. (no, my quad ribbon controller is only working if you test-clip it together with 9V batteries). I propped a Roland KC-60 (a small 40-watt keyboard amp/speaker) into the garage window, put up four colored LED strobes that I bought at K-mart, and ran the Dotcom in real time, just from the knobs and cables.

And- it worked! I channeled Edgar Winter and Tangerine Dream and Forbidden Planet and Rocky Horror and every bad SF movie soundtrack ever seen on the Creature Feature, and the trick-or-treaters loved it! I got responses like "Best on the street" and "You really kicked it up a notch." and "Wow. Totally UFO-ville".

One said "It makes the whole neighborhood more halloweeny." "Oh, should I turn it down?" "No, it's good this way."

And best of all, at the end, a parental unit even asked if it was "one of those synthesizers like ... uh...um..." and made plugging-and-unplugging motions. "Like on the cover of 'Switched-On Bach'", I asked innocently. "Yeah, like that!"

I grinned and smiled. No better reward possible.

---- Synthesizer Geeking Follows -----

Things learned:

You don't need a lot of oscillators. I used 2 Q-106 oscs and the Q-150 ladder filter, in 24dB mode as the main sound chain, with the ladder filter flicking in and out of resonance. I have a quad LFO from SSL (thanks Doug!) that I used to modulate filter frequency and resonance continuously, so even if I was at the door handing out candy, there was still "motion" in the sound. The resonance really added a lot to the pulse-wave
wailing from the Q-106's (which were usually tuned either an octave or an octave and a fifth apart); I really like the sound of a filter at the edge of resonance as the filter bends around the incoming signal.

I also used an Encore UEG to put a slow (60-second-plus) wail into the lower of the two audio oscillators. Yet more motion to prevent boredom. I used a Q-125 signal processor to play with gain and offset for the quad LFOs, and that was about it; I had a Q-171 quantizer in line early on, but I didn't like the effect, so I patched it out while other stuff was still playing and didn't go back. I tossed a Q-115 reverb into the mix near the end (as well as an SSL digital delay line) but it didn't do much for the sound.

IMHO, multiples are suboptimal. Get a pack of "twofers" (2:1 1/4 jack stereo splitters) instead; things like this. Be sure to get either mono-in to mono-out or stereo-to-stereo.

http://www.ebay.com/itm/10X-Gold-2-way-headphone-splitter-1-4-stereo-jack-Lot-/250719228927?pt=LH_DefaultDomain_0&hash=item3a6007d3ff

These twofers are not super quality, but they're cheap (10 for $14). And they make it much faster to patch and avoid the "mult thicket" problem where you have 12 wires leading into a 1-MU block and no clue what any of them do. When the STG wavefolder comes in, I will probably pull my last mult module out and go
pure "twofer".

Surprisingly, you don't need a lot of _rack_ for performing live (for Halloween, at least!). I have a pair of P22 cases and I only used one of them for the whole performance.

If you ever get the chance to perform live, try it!

- Bill
Those of you who know me (more or less) know that I've been a fan of synthesizers for ... well, most of my life. Kraftwerk's AUTOBAHN, Edgar Winter's FRANKENSTEIN, Carlos' SWITCHED-ON BACH and CLOCKWORK ORANGE, Tonto's Expanding Headband; these are a few of my favorite things.

I did dabble in grad school with some smaller synthesizers, but I never had the time or the money or the space for one of those modular monsters that you saw on the cover of Switched-On Bach.

Until this year. I finally bought a modular synthesizer; used, half the slots empty, but fully functional. It's a "Synthesizers.com" (a.k.a. a "dotcom"), the same form factor as the classic Moog modulars, but even more modular (i.e. any module can go in any position; there's no "half-size row" nor any backpanel wiring other than the power squid, and since then I've added a module here, a module there... and now it's a little over-full.

It has big meaty 1/4" jacks and a crateful of 1/4" patchcords to connect up the various functional modules, and is covered in thick black naugahyde.



Never underestimate the aesthetics of a musical instrument. It should sound good, but it should also make one _want_ to play it.

Every function on this machine has a knob or a switch. No menu diving, trying to navigate via a little two-line LCD. The knobs glide, with just enough viscous damping that you can set it "just there". (and no, none of the knobs go up to 11. There _are_ knobs that go -5 to +5, so it's 11 but really not quite. Does that make sense?)

It's _wonderful_. I can just sit there for an hour or two and come up with a little musical ditty that nobody else has ever heard before.

Nobody? I'm pretty sure that nobody ever did. Here's why... I had a little drink and did a count of knobs, switches, and jacks of this machine.

I have:

  • 109 analog knobs (call them 0 to 10, for 11 discrete states)
  • 6 6-way switches
  • 11 3-way switches
  • 15 2-way switches
  • 91 input jacks
  • 71 output jacks

  • So, how many different combinations can this thing be set to (don't worry about whether or not whether a particular configuration actually makes a sound or not; no configuration is more than one cable change or knob twist from a combination that _does_ make a sound).

    Well, there are 109 knobs that go from 0 to 10; that's 11^91 settings right there (although there are probably at least 100 easily repeatable values, the sound change between each one may not be readily discernable. 11^91 is 5.84E94 possibilities.

    Then there are the switches. 6^6 * 3^11 * 2^15 = 2.7E14 combinations, just on the switches. (for this purpose, I'm ignoring the switches on the MIDI inputs; we're looking only at the sounds that the modular synth can make _on it's own_.)

    Finally, there is the patch cord system. There are 91 input jacks; each and every input jack can be fed from an output jack (all signals, be they audio or control, share the same voltage range and impedance (mis)match, and so are compatible to plug together. You can also leave a jack unfed (so there are 71 outputs, plus a hypothetical "no connection plug" meaning "plugged into nothing", for a total of 72 possible inputs to each input jack). That's 72 options, repeated 91 times or a total of 72^91, which is 1.04E169 options. (Yes, the concept of "multing" makes it a little more complicated, but the synth has two "mult" modules and I also have a box of "twofers" that piggyback two jacks into a single plug, so to a first approximation it really is a 72 -> 91 full crossbar interconnect.)

    Multiplying it all out, that's (very roughly) 5E94 * 3E14 * 1E169 ~= 1.5E278 possible sounds (many of which _sound_ like silence, but that's not our worry here).

    If I can do one of these sounds every second, then that's ~5E270 _years_ to hear them all.

    For comparison, the whole universe is only about 15E9 years old. At about E40 years, all protons are predicted to have decayed, and there won't _be_ any matter to build synthesizers out of. Even if every proton in the universe is somehow able to be made into a synthesizer, it would still not be enough to listen to every sound that the machine that fits on my kitchen table can make.

    So, very frankly, when I sit down and just "noodle around", it's highly unlikely that I'll hear anything that will ever, ever be heard again. There isn't the time enough- in a very literal sense.

    Zathrus was wrong. You _can_ run out of Time.

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    A Drunken Philosopher

    August 2017

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