When Triangle waveform is not triangle?

The Moog Forum Minimoog Forum
1

I’m new here so hello to you all.

My problem is that my Voyagers triangle waveform isn’t actually triangle (triangle’s top has a dip) and I was wondering whether this a feature or do I have bad oscillators? I compared my Voyager to a Minimoog and it’s triangle waveform was indeed triangle. I contacted Moog tech. support few weeks ago but since they didn’t answer I’m asking this question from you guys. I have the waveforms and screenshots of them but I couldn’t upload them here so if someone could check the Voyagers triangle waveform for me and let me know.

I

2

ime theyre never really what they geometrically should be when looked at in a scope. the ms20 is the worst one. you should see its “squarewave”.
seem to remember reading that the triangle having a dip was seen at the old 901 modular osc

3

The oscillators are different and when the wave is the same on my photo it is OK.
Have fun,
Rudi

4

Thanks for quick answers. I Have those dips on positive side of the waveform and seems like you have them on negative. I don’t know if it makes any difference. The sound is kind of “razzy” and the overtone series looks different than in Mini.

I

5

A while back I posted a document on the SquareWave site revealing Voyager waveform details. Though not quite as scientific as using an oscilloscope, you might find it helpful:

http://launch.groups.yahoo.com/group/Squarewave/files/Resources/MMV_Waveforms.pdf

Greg

6

I too was concerned about the shapes of the waves, as I was using my Voyager to demonstrate synthesis last year. I asked about the reason for them being different from their associated graphics and was told that this is so because they are tweaked in the factory to make them more musical. Also, in the case of the square wave, it impossible to truly produce. Fascinating stuff.

7

Can anyone post a Voyagers Triangle waveform clip (say 440Hz) so I could compare that to my instrument?

I

8

9

Thank you so much for the information. So the “notch” is left there intentionally and it is not an oscillator malfunction right? Any ideas how can I get “pure” triangle wave out of my Voyager (this is what the picture implies at the oscillator waveform knobs)?


I

10

as seen on these pictures the original mini has a little more harmonics on square and sawtooth and a little less on triangle.
voyager1: i think its intentional and as for getting pure trinagle; you cant really but closing the filter a bit will get you closer