SynthMaker

Morph osc

Archive · 2010 8 old posts

From the original SynthMaker forum (2004–2014), with its members’ names and dates.

JerryBeats ·

I've been fooling around with synthmaker and recently I programmed a morph osc. I came up with the idea when reading an old topic. It morphs between saw and square waveform but you can easily change that. I Used an oscilloscope I found on an old topic to monitor the waveforms. Of course you want to send some cv to the morph parameter so I added an input for that too.

Most of you will probably think this is easy stuff, but maybe it can help someone here. If anyone knows a way to improve the oscillator please do so or tell me how to.

infuzion ·

Welcome to SM JB!

JerryBeats ·

Re: Morph osc by infuzion on Sat Oct 02, 2010 10:06 pm

Welcome to SM JB!

thanks man

JerryBeats ·

Here is my improved version of the morph oscillator. I've added dynamic phase inputs for both waveforms. I also added the hard sync input on the osc. when I tried to add other types of waveforms it got bugged so I didn't include them.

JerryBeats ·

Finally I added PWM to the square of the morph osc.

have fun

trogluddite ·

Aha, you sussed the PWM from the ramp phase! There's a little modification I found that helps it work a little better - you may have seen that modulating the pulse width adds a DC offset to the waveform (see the scope trace move up and down). I have never tried to do the maths to work out quite why this is, but by a process of elimination came up with this...

...no idea why the correction factor should be 0.85, but it always seems to work.

JerryBeats ·

trogluddite wrote: Aha, you sussed the PWM from the ramp phase! There's a little modification I found that helps it work a little better - you may have seen that modulating the pulse width adds a DC offset to the waveform (see the scope trace move up and down). I have never tried to do the maths to work out quite why this is, but by a process of elimination came up with this...

...no idea why the correction factor should be 0.85, but it always seems to work.

You're right, I really didn't know why it moved up and down but I thought it wouldn't be a big deal. thanks for tweaking it, I 'm gonna try it right away. Do you by the way happen to know a way to moprh a waveform into a triangle???

trogluddite ·

I did have a go once at 'PWM' for triangle>>saw, but gave up coz I just couldn't get rid of the aliasing.

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