Moog Music Forum

how do i change the proportions of a pulse wave in my beloved voyager?
thanks

By the proportions, do you mean the intervals in which they rise and fall? You should be able to do that with the AMOUNT knob.

Hello,

The duty cycle of the pulse wave on the Vger's oscillators is selected by
setting the wave knob in the oscillator section to a value between and
including 7 and 10 (panel legend value)

Regards,


Lawrence

Hi Amotz,

Lawrence is correct about the WAVE knob settings regarding square and pulse waves (7 - 10 on the dial). Allow me to offer some additional detail here:

If your Voyager is configured to display the parameter values (PANEL Mode/1.2 Parameter Display/Yes), you'll get a square wave with a WAVE knob setting of '179'. Note that this is the same value you get when you initialize the parameters of a patch (EDIT Mode/1.3 Init Parameters). Using the INIT command, all three oscillators are set to square waves.

You might also be interested to know that you can duplicate the pulse wave settings of the original Minimoog (the Model D) using these values:

Pulse Wave (35%): 220
Narrow Pulse Wave (15%): 250

Hope this helps.

- Greg

GregAE wrote:You might also be interested to know that you can duplicate the pulse wave settings of the original Minimoog (the Model D) using these values:

Pulse Wave (35%): 220
Narrow Pulse Wave (15%): 250

The Model D actually had six waves you could select from. You only covered three (square, pulse and narrow pulse), leaving the triangle, sawtooth and triangle/sawtooth waves. On a Voyager, a triangle wave should be '0', and a sawtooth somewhere around '90', so that just leaves the tri/saw wave. What's a good value for that one?

To duplicate the six Model D waves, use these WAVE knob settings on the Voyager:

Triangle Wave: 000
Tri-Saw Hybrid Wave (aka 'Sharktooth'): 025
Sawtooth Wave: 088
Square Wave: 179
Pulse Wave (35%): 220
Narrow Pulse Wave (15%): 250


- Greg

The voyager waves are considerably rounded compared to a minimoog - there are no sharp edges shown on an oscilliscope and the sounds are a bit mellow. Being a subtractive synth there should be as many harmonics in the raw waves as possible.

From memory, the real minimoog triangle actually has a brief spike in the otherwise diagonal ramp up and down of the triangle shape. While technically a flaw in converting a saw shape to a triangle, it provides more harmonics.

This waveform rounding is a shame because as an analog signal you can have very rich waves without the limitations that digital synths have (aliasing and limited bandwidth).

Have you scoped the output of the FreqBox perchance???