[sdiy] Low Frequency Square to Sine Waveshaper

[Florian Anwander]

Hi Magnus,

> both sources to the square and sine-waves. However, to create a sine-wave you
> weight together 5 squares (the fundamental and four overtones) with resistors
> and then put a capacitor to ground (or over the negative feedback of a
> buffering op-amp) on the output for final rounding off effect. 

If the master clock oscillator of this kind of LFO is voltage 
controlled, it would make sense to use also a VC slew limiter. If the 
oscillator speed is controlled only by an pot, then use a dual pot where 
the second pot is used to control the slew rate.

Florian