Changing BPM of tracks.

Not really…

There is software around to get a better smoother sounding audio, but like everything nice n shiny.. it costs..

My rules r to never go 10 BPM either way of the root BPM of ur loop/track. There is a mild exception to that rule that in time-stretching something faster allows u to get away with a little more so -10 and +10 or +20 BPM sound ok to me… The exception to the faster BPM rule is that pitched acoustic instruments (guitars, pianos n the rest) start to sound unnatural..

I’d say neither r really suited to time-stretching acapellas…..

Ableton or Acid Pro would be ur tool to laying down an instrumental and acapella n adjusting its BPM and the quality would be better than trying to ‘manually’ try to time-stretch in Recycle..

U can download a free version of Acid Express, but Ive got no idea about its features as I’m fortunate enough to have Acid Pro.

I dunno if any other users on here have experience on Acid Express or whether indeed it can be used to do mash-ups…

fl studio is good

I’ve noticed that higher bitrate MP3s don’t get that timestretch problem as bad.

I didn’t used to care about that, but now I tend to go for wavs as well. I still rip my CDs as MP3s though.

i use acid. i thinks its the easiest to use

both Live and Audacity is good for this

Using the Time and Pitch machine in logic retains awesome quality while getting up to really high numbers, like +/- 40

Logic Pro

FL Studio works pretty damn great for stretching vocals and such, up to a pretty massive extent. And I’m pretty sure it can be done in the demo version of FL Studio that you can download off their website, as the demo version doesn’t really have any limitations other than being able to save .flp files (although you can still export .mp3 and .wav’s and stuff).

It also offers tempo detection, of course, so that works great too. It’s just a matter of importing the clip onto the playlist, then clicking on the little arrow to the left of the name of the audio clip, then clicking "Fit to tempo.." Generally telling it to search between 100-200 bpm will work fine, but if you know the range that the bpm is in it also works to go with that too. It’ll change the tempo, then you can open up the clip properties by double-clicking the clip on the playlist, and set the stretching from "Auto" to "Pro Default" in the drop-down.

You can now change the tempo of your project (up by the play button) and your clip(s) will stretch accordingly, and they’ll also keep whatever pitch they were in (as long as the Pro Default stretching setting is used). I can make a more detailed tutorial (I suppose), if anyone is confused or is interested in how to do this with FLS.

Oh: Also worth mentioning is that things like Traktor offer Pitch Lock and stuff like that, and often times it’ll sound crappy until you go into the Settings and bump the "Pitch Lock" processor usage up to whatever is the highest possible setting. At that point you can stretch up to about 50% speed without it beginning to affect the pitch. For the longest time I didn’t know this, and just avoided using the Pitch Lock :p

izotope made a very good pitch and time stretch product for logic (it gets added to logic’s pitch and time machine) called radius. but it looks like it’s 32 bit only. don’t know if they’re going to release it in 64 bit. also it’s $399.

complex warp in ableton works the best for most tracks that i use for house/techno