Convert Variable Values

I'm having a bit of trouble wrapping my head around something.

I'm struggling to control variables, here's an example:

Say if I have a number variable called speed, it starts at 0. If the player presses up, every tick add 1 to 'speed' - if player releases up, every tick subtract 1 from speed.

First question is how do I 'clamp' the variable so that it never extends past a max or minimum speed?

Second question is how would I use this 'speed' variable to affect something else which uses a different numerical range, let's say volume, at 0 speed, volume should be 0db at 50 speed volume should be 0.5 etc

I know how to set 'volume' to 'speed' - but I don't want the volume to have a range of 0 - 100, I'd like it to be 0 - 1 - or even if it was something wild like timescale, I'd like timescale to be affected by 'speed' but with a range of 0 - 1.5 instead of 0 - 100.

Am I explaining this okay? I'm pretty confused over the matter haha.

Best,

Mik

System expressions are what you're looking for question 1.

The clamp() expression is listed in the category "Values" in the expressions dialog.

For question 2 it looks like a ratio where you would divide the first value by 10 (or 100 ?) to get value 2.

Also you should have a read at delta time and framerate independence and rethink your design (don't add a "fixed" 1 every tick, you'll have different executions on differently powered CPUs).

Example capx.

Thanks man very useful!