pitch will not effect bpm. speed and tempo both will change bpm, with the difference being, changing speed will change pitch and tempo together. tempo is just changing bpm not pitch.

I haven't been able to make any changes on the fly other than volume and pan of individual tracks.

None? That sounds really annoying. If people want to hear my videos at 1.15x they can use the speed controls in youtube itself.

probably not , especially if all you have is audacity as that only lets you edit the audio rather than the actual track sequence where you could edit the actual individual elements and notes of the song. with audacity you could only do stuff like pitch the song up and down, slow it down or speed it up, but not rly "edit" the song

do you have access to the original file for the daw the song was created in ?

I wouldn’t test your luck with Audacity honestly. It’s pretty limited even on the recording side. Your best bet if you wanted to get the vocals more on key would be to find and download a free daw (cakewalk for windows or GarageBand/logic free trial for Mac), and then download MAutoPitch by MeldaProduction. It’s a pretty solid free autotune plugin. It’s fairly simple, and you might be able to use the same plugin in audacity if you don’t want to download a different Daw.

Switch to waveform view on the track that has that instrument on it, select the note, then use the change pitch plugin.

First of all, save the original track. Copy it. Work on the copy…

Duplicate the ENTIRE TRACK, so you have two identical copies of the entire track.

Figure out the frequency you are trying to isolate.

On track one, select the entire track and do an extremely narrow EQ centered around the target frequency. I am talking MASSIVE differentiation. Like -60dB leading up to the frequency, and -60 dB after the frequency.

On track two, do a massive EQ, erasing the frequency in question.

On track one, do the pitch shift.

Recombine the tracks.

This will sound awful, in all likelihood. But I think it is as close as you're going to get.

You can export as a wav your entire song then load it in the sampler and play around to kinda switch it up in a cool way

Are you on IOS or Laptop?

https://forum.audacityteam.org/viewtopic.php?t=101575

Use varispeed. You don't even have to do the math, you can enter -1 step and it'll slow the audio down accordingly.

you can load in an entire song as a stem, turn on flex mode & just stretch the song until it sounds the way you like it

Pitch doubles going up by one octave. Pitch is based on frequency, so ur idea could work presuming u are talking about audio tracks. Did u try it out?

Click on the audio clip menu in the playlist and select fit to tempo and enter the bpm.

https://youtu.be/u8TEcy1gqs0?si=M2voZyXd9CveLVql

You wat to increase the tempo without it sounding faster??? That makes 0 sense.

Re-record those parts after you change the tempo.

Record to the sound of the metronome so you’ll be on beat.

I think I understand what you are trying to do because I have the same problem (but with recording midi tracks): I'm an amateur, and indeed this may seem incomprehensible to a pro, but here's what happens: I roughly adjust the tempo of the project, then I record my melody playing it as I feel. So obviously I'm not at all set on the tempo of the project. And then I would just like to be able to adjust the tempo grid to “match” it as best as possible to what I played. But of course, if we change the tempo of the project, then we change the rhythm of the song. When in fact we want to do the opposite: keep the midi track as recorded (so with the same real durations), but change the tempo of the grid to be able to bring it as close as possible to the notes played (and then possibly end with a correct Time).

Obviously for a pro this must seem an aberration because he plays straight at the right tempo, but for an amateur like me it's not possible, even if I try to use the metronome.

So there you have it, I hope I have helped to understand what is being sought: basically I would say that it amounts to modifying the tempo but with a Time stretch of the midi tracks to compensate for the change in tempo. And thus have a project tempo that better corresponds to what we played.

PS: Personally I'm not on Fl studio but on an MPC, so does anyone know how to do that on MPC?

PS 2: for FL studio here is a post that I found and which seems to be a solution (not tested because I don't have FL): https://fr.audiofanzine.com/workstation/akai/mpc-key-37/forums/t.821257,creation-remixes-ajuster-bpm-sur-akai-mpc-key.html

this?