Convert envelopes parameters values to time

Hello everybody

I'm currently trying to port a huge sound library as a MPC2500 program. This library notes envelopes parameters (attack and decay ...) are modeled with a time in millisecond unit.
In the MPC2500 this parameters have no explicit unit. The value can vary from 0 to 100.

My problem is that I'm am unable to translate the milliseconds values to the MPC2500 values (0 - > 100). It forces me to ear each note and adjust each parameter.

I've tried to reverse engineered the envelope behavior by using a reference signal and varying values but I didn't found any universal rule.

Do you know this rule or a calculation to translate millisecond envelope parameters values to MPC2500 envelope parameters value ?

Jonathan

I think the envelope times vary according to the length of the sample, so they are dependnt on how long the sample is. I don't know what it is you want to do, but I'd say use your ears.