About the CS5

[Paul Perry]

At 02:36 PM 13/10/97 +0200, Daniel Eriksson wrote:
>Hello!
>Is there anybody who knows how I can get the portamento working on my Yamaha
>CS5?
>I control it from my Doepfer Analog Sequenser but that doesn´t give me any
>portamento option. Can one "reroute" the portamento inside the CS5 so I can
>get the effect when it is controlled from an external source? Same goes for
>all other synths with this "problem"...
>
>Another question: How is the easiest way of converting a V/Oct CV to Hz/V
>(without midi)? I know Korg had a converter back in the days but how about
>building one?
....if you have a spare V/Oct synth..no matter how primitive....then let it 
generate a clean note, and feed this to a simple (one chip) Freq to Volt
convertor...... this is the only simple way IMHO if you want something in tune.

The beauty is, if you want MIDI to drive a Hz/V synth, you can take the
output from 
a module & do this.

The portamento is likely to be harder, but it is usually possible to arrange a 
light dependant resistor/led combo with the ldr replacing the resistor that 
delays the charging of the capacitor holding the CV for the oscillator..
but this is very circuit specific.. don't know what a CS5 looks like here.

Now reading the question again it looks like the CV in must bypass the whole 
portamento section, if the portamento has no effect when the Doepfer is running
it. But it would be possible to make a portamento circuit fairly easily, to go 
between the Doepfer and the CS5.... and if the Doepfer has a spare CV out, then
you can use the ldr trick here, and not have to hack the CS5 at all.

paul perry melbourne australia