How to Repair a Poly-61

Click here for a website on how to repair the Korg Poly-61 via Michael.

"Welcome to my documentation of the odyssey repairing some Poly-61s, as i recently bought 3 of them with the intention to get at least 2 of them working perfectly. If you want to repair a Poly-61, i have to warn you - it is quite a lot of work to get it perfectly working again, if it has the full repertoire of usual problems of this synthesizer. First of all, if you don't want to do a full restoration, you should know a bit about the inner workings of the Poly-61. This is where i want to start. So let's have a look at the anatomy of the Korg Poly-61."

Update: unfortunately the link above is gone. I found the following from Really Nice Audio: 


POLY61 RepairS video upload by Really Nice Audio

"By changing the switches and cleaning the keyboard contacts you can bring a synth back to its former glory."

Continuous Signal Processing: The Fourier Series

via AH regarding the following question:

"Does anyone know the formula for calculating the resulting harmonics the formula for calculating the resulting harmonics of a pulse wave when the pulse width is varied? In other words, a square wave (or pulse wave with 50% duty cycle) has only the odd-numbered harmonics present; how do you determine the harmonics present when the duty cycle is 25%, or any other value?"

Dave Manley followed up with a link to this site.
"This brings us to the last member of the Fourier transform family: the Fourier series. The time domain signal used in the Fourier series is periodic and continuous. Figure 13-10 shows several examples of continuous waveforms that repeat themselves from negative to positive infinity."

Update: also see this Synth Secrets article on Sound on Sound.

ARP Omni and Omni 2 Repair Page

On marksmart.net:
* Common failures on the ARP Omni and Omni 2
* 4075 Filter modification
* Power supply modification
* Imitating ARP string sounds
* ARP slider caps

Roland Ace Tone Top-1 Udpate

I missed the auction link in this post. It's up. Sorry about that...

Waldorf Pulse Pluse Demo

Pulse-Demo

via Noiseprofessor

Synthex Workshop

Synthex_workshop.mp3

Nord Wave Manager

"The Nord Wave Manager is now availabe in the Nord Wave download area. This is the application that allows you to edit, create and load collections of samples to and from the Flash memory area of the Nord Wave synthesizer. The Manager will also act as a librarian utility for the Program memory area." link

KikAXXE software synthesizer from Way Out Ware.

YouTube via wiretotheear
"The KikAXXE is a virtual synthesizer, drum machine and analog sequencer. It's great fun. After you watch this video be sure to try the fully working 30 day demo from www.wayoutware.com. For more videos, tutorials and pro-audio articles visit www.wiretotheear.com."

Update via Oliver Chesler in the comments:
"You can also see this in a higher resolution here"

yamaha cs-10 song

YouTube via maxmonomusic. Follow up to this post.
"All synthsounds except drums in this song comes from a yamaha cs 10 monophonic analog synthesizer. for more cs10 go to www.myspace.com/maxmonomusic"

Yamaha CS 30 analogue synthesizer

YouTube via ultragrid

"Yamaha CS 30 Vintage Synthesizer demo - No Music or Tracks - just 8 min of what you can do with the beast...analogue compact mono synth ;-)"