Help needed: switch+pot weight

[carlic]

Hi

Pretty fresh with the open tx so I do need some help mixing seemingly a easy task.
I would like to assign a channel to a 3 position switch and limit the amount of deflection (weight) in either direction by a potentiometer.

For example:
-center position of the switch is 0%
-the potentiometer should control the weight from 5% pot at min, and 20% pot at max. This should work in both directions of the switch symmetricaly.

Help is appreciated!

[MikeB]

Use 2 mixes on the channel (example using SA as the switch and S1 as the pot):
+ 50% SA
*= 15% S1 Offset(25%) - a multiply mix.

If you used 100% in the first mix, you would need 7.5% in the second mix, which is why I've suggested 50% and 15%.

Mike

[carlic]

Worked like a charm!

Thank you!

[carlic]

Would you be so kind to write down the math used?

Thanks

[MikeB]

You wanted to scale the normal 0-100% onto 5-20%. 5 to 20% is 12.5% +/- 7.5%.
Since you may only use whole numbers for the weight I suggested reducing the switch controlled mix to be 0-50%. Now the scaling to get between 5% and 20% is doubled to 10% to 40%. This is 25% +/- 15%, so the multiply mix uses a weight of 15% and an offset of 25%.

Mike