[sdiy] Silly vector synth question

[Tom Wiltshire]

On 6 Feb 2011, at 14:32, Colin f wrote:

> 
>> Nice.
>> This is using the method Magnus suggested, isn't it?
> 
> Possibly... I only just saw Magnus' post.
> Here's the formula I used:
> http://www.colinfraser.com/vector-pan-formula.gif
> I filled in the purely linear values for x distance = 0 and y distance = 0
> The formula shown for D4 can be auto-filled to the rest of the table.
> Two divides and a subtract is probably easy enough to not bother with the
> LUT.
> 
>> There's one quirk though. If you push the stick fully NE 
>> (say), the X and Y positions is *not* 100, 100, since the 
>> joystick can only move out the the edge of a circle. From 
>> what the Sequential manual says and the examples, it looks 
>> like they dealt with that too.
> 
> Is that true ? I've never seen a VS in the flesh.

Me neither. I'm just going on what they say in the manual.

> In that case, you could just map the diamond within the 4 closest points to
> each corner you can reach with the stick.
> If the distance for any osc is > 100, its value remains zero.
> I suppose that gives you a bit of a dead-zone where you can be sure you only
> get a fade between two oscs.
> Does the VS do something smarter ?

I doubt it. That seems fairly reasonable, and like you said, a bit of a dead zone where you can easily fade between just two oscs is no bad thing.

Thanks,
Tom