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Slow down and speed up... With an app?

coloringpadcoloringpad
edited May 10 in General App Discussion

I want a track (already recorded) to speed up over an extended period of time and keep the pitch. Any apps that could even do that?!

If there is an app that can modulate tempo I think I would love to experiment with that, even if it isn't for prerecorded recordings. I can imagine sine, square, saw, etc. slowly modulating the tempo while the track plays. Keeping pitch would be a huge plus.

Am I out in space on this one? Have I finally lost my mind? Possibly.

Comments

  • wimwim
    edited May 10

    For audio clips? Transparently and with high quality? Not really.
    With some artifacts and significant CPU load. Sure.

    Best to stick with MIDI playing apps live rather than stretching audio. Tempo changes are easy that way.

    Loopy Pro is one of the best for this. It can ramp tempo. It's especially effective with MIDI, though it will manage audio with some degradation in quality at least temporarily during continuous tempo changes. Continuous changes are very challenging with audio stretching.

  • coloringpadcoloringpad
    edited May 10

    @wim said:
    For audio clips? Transparently and with high quality? Not really.
    With some artifacts and significant CPU load. Sure.

    Best to stick with MIDI playing apps live rather than stretching audio. Tempo changes are easy that way.

    Loopy Pro is one of the best for this. It can ramp tempo. It's especially effective with MIDI, though it will manage audio with some degradation in quality at least temporarily during continuous tempo changes. Continuous changes are very challenging with audio stretching.

    Now that is a detailed response! And I didn't know Loopy Pro could ramp tempo. Whoa. Thank you.

    How does it do that?

  • coloringpadcoloringpad

    @coloringpad said:

    @wim said:
    For audio clips? Transparently and with high quality? Not really.
    With some artifacts and significant CPU load. Sure.

    Best to stick with MIDI playing apps live rather than stretching audio. Tempo changes are easy that way.

    Loopy Pro is one of the best for this. It can ramp tempo. It's especially effective with MIDI, though it will manage audio with some degradation in quality at least temporarily during continuous tempo changes. Continuous changes are very challenging with audio stretching.

    Now that is a detailed response! And I didn't know Loopy Pro could ramp tempo. Whoa. Thank you.

    How does it do that? (edited to clarify) I mean, how do I do it?

  • NeuMNeuM

    @coloringpad said:
    I want a track (already recorded) to speed up over an extended period of time and keep the pitch. Any apps that could even do that?!

    If there is an app that can modulate tempo I think I would love to experiment with that, even if it isn't for prerecorded recordings. I can imagine sine, square, saw, etc. slowly modulating the tempo while the track plays. Keeping pitch would be a huge plus.

    Am I out in space on this one? Have I finally lost my mind? Possibly.

    Depends on how long is "an extended period" and it depends on how slow it starts and how fast it ends. You could conceivably do it with Logic Pro on iPad or desktop. You could also do it on desktop with GarageBand, but not on iPadOS with GB.

  • cokomairenacokomairena

    Deejay can do it in real time for free

  • wimwim
    edited May 10

    Loopy has actions for adjusting the tempo. There are many ways you could use them. For instance, you could add a button with an Adjust Tempo action to either set the tempo to a predefined number, or to nudge it up or down. There's a Ramp setting in either seconds or beats/fractions/bars.

    Or, you could add a slider or knob and use that to change the tempo. You could also use midi out from something like Rozeta LFO to modulate the tempo by binding the midi output to a widget that adjusts the tempo.

    There are lots and lots of options.

  • wimwim

    Here's a screenshot of Rozeta LFO sending CC 15 to a knob that adjusts the tempo between 90 and 130 bpm.

    But, automating the tempo is one thing. How it all sounds when doing that is another thing. If Loopy has to time stretch a bunch of audio clips it's going to be rough going. If it's playing back midi generators the going will be a lot easier.

  • bygjohnbygjohn

    Just to chime in with another option, clock modulation in MiRack is easy, and there are some LFOs capable of going very slowly.

  • rototomrototom

    flexi sampler (a drambo module) lets you modulate speed and pitch independently.

  • wimwim

    You can send an LFO to AUM’s tempo control too.

  • Sam23Sam23

    https://apps.apple.com/at/app/warp-baby-audio/id6738417201

  • GavinskiGavinski

    @Sam23 said:
    https://apps.apple.com/at/app/warp-baby-audio/id6738417201

    As cool as Warp is though, it definitely has artifacts and the buffer is of a fixed size. If you change settings while it is running you'll run into issues eventually when it swaps out the old buffer for a new one.

    I agree with suggestions upthread - stick to midi for this!

  • coloringpadcoloringpad

    This is why this community is great. Looks like I have homework to do... Homework that I'm looking forward to!

  • FlowingRobesFlowingRobes

    Hi,

    What about Beat maker 3?

  • wimwim
    edited May 11

    @FlowingRobes said:
    Hi,

    What about Beat maker 3?

    It does time stretch well, but how would you use an LFO or something to modulate the tempo?

  • FlowingRobesFlowingRobes

    Hi,
    I think I would assign one of the tempo focus actions to a cc and use a midi tool to convert LFO to cc?

    I don't use LFO four this.. So I'm not sure bout that part. Sorry. I know bm3 loves link.

    I use my foot and 2 taps.....and midifire and midi link sync. But that's another story.

  • wimwim

    @FlowingRobes said:
    Hi,
    I think I would assign one of the tempo focus actions to a cc and use a midi tool to convert LFO to cc?

    I don't use LFO four this.. So I'm not sure bout that part. Sorry. I know bm3 loves link.

    I use my foot and 2 taps.....and midifire and midi link sync. But that's another story.

    Thanks for the insight. I'm tempted to try, but I use BM3 so little these days I'll leave it to others. 😉

  • FlowingRobesFlowingRobes

    Hi,

    I hear ya. The ironic thing is I was doing it virtually flawlessly with an Air 1! At 256. Now with my 8th gen I'm down at 128.

    Frankly , bm3s time stretch smokes my Reaper daw.

  • wimwim

    @FlowingRobes said:
    Hi,

    I hear ya. The ironic thing is I was doing it virtually flawlessly with an Air 1! At 256. Now with my 8th gen I'm down at 128.

    Frankly , bm3s time stretch smokes my Reaper daw.

    Yep. Sure would be great if that sampler ever came out as an AUv3. It'll never happen though.

  • jimhanksjimhanks

    Cubasis 3 claims to do this now. I haven't personally tried it though

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