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S e p t W c t ^ '' - 1981 — S 2 . 5 / J \ f l \ % ELECTRONICPOLUPHOIMU MUSIC & HOME RECORDING ISSN : 0161- 4M4. ; 1 lasr *SkSi? 5 'jh 'SS O'J Psycho-Acoutic Experiments / Super Controller for SyntAe THE ULTIMATE KEYBOARD The Prophet-10 is the most complete keyboard instrument available today. The Prophet is a true polyphonic programmable synthesizer with 10 complete voices and 2 manuals. Each 5 voice keyboard has its own programmer allowing two completely different sounds to be played simultaneously. All ten voices can also be played from one keyboard program. Each voice has 2 voltage controlled oscillators, a mixer, a four pole low pass filter, two ADSR envelope generators, a final VCA and independent modula tion capabilities. The Prophet-10’s total capabilities are too The Prophet-10 has an optional polyphonic numerous to mention here, but some of the sequencer that can be installed when the Prophet features include: is ordered, or at a later date in the field. It fits * Assignable voice modes (normal, single, completely within the main unit and operates on double, alternate) the lower manual. Various features of the * Stereo and mono balanced and unbalanced sequencer are: outputs * Simplicity; just play normally & record ex * Pitch bend and modulation wheels actly what you play. * Polyphonic modulation section * 2500 note capability, and 6 memory banks. * Voice defeat system * Built-in micro-cassette deck for both se * Two assignable & programmable control quence and program storage. voltage pedals which can act on each man * Extensive editing & overdubbing facilities. ual independently * Exact timing can be programmed, and an * Three-band programmable equalization external clock can be used. * Program increment footswitch * Ability to change programs automatically in * Programmable volume control and a master the sequence. volume control * Transpose facilities for instant pitch * Octave transposition switches changes. * Upper & lower manual balance control * A-440 reference tone The Prophet-10 comes complete with a high quality flight case, two voltage pedals and two foot- switches. It’s now available; see your local dealer. Play the Prophet-10 today-It s your ULTIMATE KEYBOARD. For more information write to: SEQUENTIAL CIRCUITS. INC. 3051 North First Street Dept. K San Jose, California 95134 S T A F r CONTENTS PUBLISHER John S. Simonton, Jr. ISSN: 0163-4534 EDITOR Volume 7, Number 2 Craig Anderton Sept./Oct. 1981 MANAGING EDITOR Linda Kay Brumfield FEATURES ART DIRECTOR/ PRODUCTION MGR. Readers' Survey................................ 9 Cynthia Rueb CIRCULATION Ramona French Peggy Walker BOOKKEEPING Helen Chalos PRINT PRODUCTION Live Plus Tape: New Technique........18 Kay Schwartz by Chris Meyer SEMCO Color Press POLYPHONY (ISSN 0163-4534) is published bimonthly at 1020 W. Wilshire Blvd., Oklahoma City, OK 73116, by Polyphony Publishing Co. Entire contents copyright Viewpoint: 2 Essays on Xenharraonics...23 (c) 1981 by Polyphony Publishing Co. All by Ivor Darreg rights reserved. No portion of this publication may be reproduced in any manner without written permission from the publisher. No patent liability is assumed with respect to the use of the Construction Tips, For Beginners.....26 information contained herein. Second Class postage is paid at Oklahoma City, by Denver Jones OK 73125. ADVERTISING rate card and deadline schedule is available upon request. Contact Linda Brumfield at (405) 842-5480. Kraftwerk Live; Performance Review....27 by Chuck Pogan DEALERS & DISTRIBUTORS bulk prices are available upon request. Contact Linda Brumfield at (405) 842-5480. SUBSCRIPTION rates: American 1 year 12.00 2 years 22.00 Psycho Acoustic Experiments..........34 Foreign 1 year 14.00 by Charles Lauria 2 years 26.00 We now accept MasterCharee 1and Visa payment for subscriptions, back issues, and PolyMart items, Foreign payments must be by charge cardL<tiu, money order, or certified chec in US funds drawn on a COLUMNS & REGULARS US bank. BACK ISSUES are available at $2.00 each Letters ........................................4 ppd. Send SASE and request our 'Back Issue List' for. a complete index of Polyphony Reviews ..............................6 issues and their features, or see the back issue ad in this issue. Editor's Note...................................8 CHANGE OF ADDRESS notifications must include your former address and zip code, and any numbers from the mailing Current Events................................. 10 label, as well as your new address. When you move, be sure to notify your Applied Synthesis: The Brass Family...........12 post office that you DO want second class and controlled circulation ublications forwarded. This will save Practical Circuitry (Super Controller)........ 26 ost or returned issues. Polyphony is fnot responsible for replacement of lost or returned issues when we have not been Details: Earth, Dirt, Rock & Ground...........33 supplied with change of address information. Equipment Exchange ............................40 Advertiser's Index ............................40 TO POSTMASTER, send address changes to: POLYPHONY PO Box 20305 On the cover: A pioneer of Electronic Music, Oklahoma City, OK 73156 Harald Bode Ph. (405) 842-5480 ^ ■ 4 nounHONy Sept./Oct. 1981 3 Steve - Sanken modules are getting hard to find, but in the 9/81 issue of Radio-Electronics, LETTERS Solid State Sales (PO Box 74P, Somerville, MA 02143; tel. 617— MORE TUBE TIPS 547-7053) is advertising Sanken 50 .... Polyphony will pay $25 per printed Watt modules for $27.50 each. page for articles on items such as equipment modification, circuit design Here's a tip on tubes that Incidentally, Greg Schneck of PGS and "build it" projects, software, might be useful to Polyphony read Electronics tried to purchase some equipment service and maintenance, ers who work with tube guitar Sanken modules for sale through interviews, theory tutorials, recording tips and techniques, and other topics of amps . his company, but had the same interest to our readers. $10 is paid The most common problems I've problems you encountered. While for each patch chart published - we want patches for any model synthesizer. We found in older (as well as some we couldn't get confirmation of also want photo or graphic submissions newer) tube circuits are inade this, it appears that Sanken is for use on our cover ................... discontinuing these models and may .... If you have never written an quate filtering of the power sup article before, don't hesitate to give ply, coupling capacitors that are be coming out with revised ver it a try. Material need not be polished too small in value (thereby res sions in the future. In the mean that's our editor's job! Illustrations and schematics can be tricting bass response), or coup time, if you need some Sankens presented as rough pencil drawings. ling capacitors that leak a lit better move fast - there aren't Photos should be black and white glossies. Text should preferably be tle. The capacitor problems stem many left. However, other hybrid typed double spaced .................... from the fact that with the old amps (such as those made by Sanyo) .... All material submitted must be paper-type capacitors, if you had sometimes show up surplus and are original and never before published. Payment is made upon publication. values that were big enough to applied in much the same way as Submissions are returned if you provide efficiently pass low frequencies, the Sankens. In fact, one of our a SASE. All materials accepted and associated copyrights become the you had to use a very low or mini regular authors is working on a property of POLYPHONY (unless arranged mal voltage rating in order to power amp article using some of otherwise) and may not be reproduced without written permission from the keep the physical size down - the new FET output hybrids that publisher. If you'd like to test your which makes the leakage problem have just been introduced to the ideas first, send 'em in. Or, if you worse. I assume that modern capa market. have any questions, let us know ....... citors make it easier to find the right compromise. But recently I THE ELUSIVE "GOOD SOUND" If any readers know of good ran across some new coupling capa books on PA installation and ap citors in a tube circuit that I've been a musician most of plications, drop us a note so that leaked just enough DC to affect my life. Recently I joined a we can check out the book for the bias of the next tube. It is group driving two Bose 802-Es with possible inclusion among Poly a good idea to mount these capaci analog delay, four mikes, and two mart's offerings. tors in such a way that you can monitor systems. I would like to DIGITAL VCO/CASIO CHIPS replace them easily and can lift have a comprehensive understanding the output end to check for DC of how to best use a system like In regard to my letter about voltage leaks. this; EQ etc. I don't know where the "Digital VCO" in the March/A- Another consideration is that to go to get info to read up on pril issue, one really interesting this. Can you suggest some books? a solder joint that might be all option I didn't think to mention I would like the band to sound right in a low impedance circuit (and haven't tried yet) is to use can cause all kinds of noise in a good but I'm a little lost. Vic Huebner's "8 Bit Pseudo-Random tube circuit, so you want a good Generator (Electronotes #67) with physical joint. Jim Falwero its 8 bit latched outputs to pro Cherry Valley, NY By the way, although it's vide a random waveshape capabili currently out of print Jack Darr's ty. It might be necessary to "Electric Guitar Amplifier Hand Jim - Unfortunately, there change the clock IC's timing capa book" (Howard W.