Dynamic Tempo Mapping is a feature that is in our feature database backlog, and has been for a long time. We prioritize it along with everything else during each development cycle and so far it has failed to make it above the cut line. This isn't because Adobe hates musicians or that video takes priority over everything else, nor does the team have some set criteria to weigh feature priority. It usually comes down to demand and dependencies. Demand comes from this forum, absolutely, but also via email, customer visits, large license-holder requests, other teams and Suites at Adobe, management, industry trends, and our own intuition. Dependencies, prerequisite features needed before implementing another, are also a critical factor in how a feature is prioritized. As an immediate example, our Player - the component of Audition that handles the summing, mixing, and output of audio to devices, treats time and velocity of the playhead as static. We can change the way the ticks on the the ruler are aligned, but a sample of audio is a sample of audio and plays back at 1/n the sample rate of the session. To support a dynamic tempo map for playback, our player would either need to adjust the speed of the playead across the timeline but keeping the session UI linear, or maintaining the current playback speed but warping the displayed content so that two identical clips might represent completely different durations. Now, there may be a more clever, simple way of addressing for the clip-based workflow, but demand has not been high enough to devote time to researching this. It also doesn't really make sense as a playback mode without a MIDI sequencer implementation to take advantage of it, However, if what you're asking for is Dynamic Metronome to help with changes while recording, that's another matter. I could certainly see incorporating keyframe parameter adjustment to the Metronome track to trigger changes to click track tempo and time signature. Right now, it's a session-level property set. In the meantime, one could set the metronome for their initial settings, make a time selection of 4 bars, and bounce the master to a new track. Mute this, change your tempo, and repeat. Loop enable these clips and you'll have a set of metronome "clips" you can drag around as needed to accomodate your changes. (Be sure to mute or disable the original metronome track after you've made your changes or things are going to get very syncopated, very quickly.)
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