[linux-audio-dev] Theremin-style controller (residual "PdDSP?")

Hi, If a PureData-powered expander turns to be a miniITX PC, then I'll stick to the benefits of my Shuttle barebone! Let's leave this "PdDSP?" thread have a little rest... Paul Winkler wrote: Not right out of the box actually! The CV outs of the PAiA Theremax have to be routed to their MIDI Brain in Fader configuration (other other equivalent-in-use MIDI trigger), so that it sends well-chosen MIDI CC's, but the MIDI Note On/Off's have still to be monitored by the next-in-chain device. But check the whole schematic (by downloading the PAiA "every-month-it's-this-month's" freebie, i.e. the Theremax manual)... Hard-dying maze! When it comes to renew the Theremin sensing principle, as opposed to remember the byegone days (no offence here), I think I can slim-out the schematic like Toby Paddock did here: http://www.seanet.com/~tpaddock/c2cv.html QProx QT300/301 are cheap Capacitance to Analog Converter IC's with 16 bit continuous or 8 bit PWM outputs: http://www.qprox.com/products/qt300_301.php And best of all, their calibration phase can simply be achieved by flicking switches at extreme hands positions! Forecoming issue: compliance with the MIDI protocol (bit-depth, transmission rate...). Pointed out by an article of a QProx concurrent, the Motorola MC33794: http://www.circuitcellar.com/library/print/0603/cantrell155/ Quoting its author: "In fact, by slightly raising and lowering my hand, I could see the discrete quantization steps associated with the MCU’s 8-bit ADC. My hand-waving experiments would have been better served with a 10- or 12-bit ADC (or an external programmable amp)." I'll expand my theory on it later (written long enough for the moment)... After all, the heterodyning principle (i.e. getting the sum and difference of two oscillators at close frequencies) was used on the original Theremin only due to accidental manipulations: during military ham radio tweakings! The trademark "beating" sound followed up... Dave Robillard wrote: I share your point of view. I just wanted to stay open-minded to prospective other users, who would justify the need of a live use... Postponed. Using laptops or sub-multipleITX PC's on the stage will certainly be more familiar by the time... Frank Barknecht wrote: PureData can already start the software compatibility list then! Cheers, Christian Frisson (who *shivers* when hearing Theremin sounds)