Time Stretch Audio using before/after BPMs

could you just set the bpm to 208, and time drag (option+drag) the item to the nearest bar maybe

Ah, cool cool, so once Reaper knows the tempo, it can adjust accordingly, kinda like having "acidized" files. Ok so you're saying to set the timebase to time, set the tempo, then change the timebase again to bars...If I hadn't already tracked everything, is there a way to avoid switching the time base twice on each track? (and you do mean tracks right, not anything I need to set on the items themselves?) Like, if I was thinking ahead the next time I track something, it there a way to make the tracks' timebase default to the project tempo? Or the tempo at the time they were recorded? I should add that in the song I was talking about, I had a tempo change. There was an intro at 125BPM then it switched to 200BPM. I wanted to increase the tempo of the 200BPM section only. I split the regions at the tempo-change marker to do what I needed. Not sure setting a track's time base and tempo would work in that case since there are multiple tempi. In the end I got it done though...AND the timestretching engine sounds pretty good to me. I forgot which option I used, but it sounds good to me.

You can set it at the project level (in project settings). If the timebase is "Time", audio will be unaffected by changing the project tempo. You can set up the timebase whenever you like - only midi items will be affected when it is set to "Time". Remember, you can set time sig markers to change the tempo where needed. Now, if you want to change all audio (as well as midi), set the project timebase to Beats (position, length, rate). Any changes you now make to the BPM will affect audio. However, it will only be affected on changes to the BPM. So.. if you have a project all mapped out at 200 and want to change a part of it up to 210, ... your project will start at 125, and have a time sig marker to change it to 200 (and maybe another one later, if it changes tempo again. Change the project settings to Beat and choose your pitchifting algorithm (both in project settings). Now change the time sig marker from 200 to 210 and all items following that marker (up to the next one) will be affected. If you don't like the sound, try a different algorithm. Does that give you what you need? Of course, it gets a little more complex if the midi is all set nicely and you only want to affect the audio, because any changes to the BPM will affect the midi too. In this case, you probably need to make a version of the project that cuts out the midi, then make your changes, glue the audio and copy the glued version(s) back into your main project. Hopefully, that makes sense :) Edit: Having hust played with it, this doesn't seem to work quite as I thought it did (or used to). You may need to split the audio first at the tempo change markers before applying the tempo change (if it spans the marker).

THANKS! yeah that's awesome. I don't do a lot of "loops" or "beats" type production, but I do have a lot of time sig and tempo changes. It looks like Reaper can be set up to work best with any type of music. The checkbox for each individual item, I'm assuming I can uncheck it if I have certain items I don't want effected by changes to the tempo markers? Like if I have speech or environmental sounds like thunder, rain etc, I could uncheck those? Reaper is pretty cool. Now I just gotta try this stuff out and get a feel for how it all works.