hey all. i'm using a monome/arduinome to write 8 values between 1 and -1 in an array and then using [tabosc4~] as a wavetable synth and then using [snapshot~] to take values and use them as control data.

it works okay but i seem to be getting "bumps" in my waveform. some values slightly less than -1 and slightly more than 1. it may be because i've misunderstood the wraparound/interpolation but would appreciate if someone could give some guidance as how to achieve "cleaner" waveforms.

i've removed the most of the monome parts for the patch. it should work fine with a bit of tinkering. cheers!

http://www.pdpatchrepo.info/hurleur/lfo.pd

Really? Four hours? Ugh...

The 4-point interpolation is what smoothes out the square wave. If you don't want that, use this:

[phasor~]
|
[*~ 8] <- however big your array is
|
[tabread]

@Maelstorm said:

Really? Four hours? Ugh...

Sorry dude, was having a pretty rubbish day.

@Maelstorm said:

The 4-point interpolation is what smoothes out the square wave. If you don't want that, use this:

[phasor~]
|
[*~ 8] <- however big your array is
|
[tabread]

This worked a treat but I now realise that I need some kind of smoothing. Still, though, using [tabosc4~] produces values of less than -1 and more than 1. Maybe that is just something I need to live with. Hmmm...

You could add a clipper after the tabosc~. Either hard-clipping with [clip~] or soft-clipping with [tanh~].

@domien said:

You could add a clipper after the tabosc~. Either hard-clipping with [clip~] or soft-clipping with [tanh~].

Cheers, this worked a treat. Here's the finished patch.

http://www.pdpatchrepo.info/hurleur/mnme64fo.pd

Another option is to run [tabread~] through [lop~]. The lower the cutoff the smoother it will be. I don't think it will give you any overshoots like [tabosc4~] does.

@Maelstorm said:

Another option is to run [tabread~] through [lop~]. The lower the cutoff the smoother it will be. I don't think it will give you any overshoots like [tabosc4~] does.

Thanks, this also worked well too.