Question: does it allow easy speed ramp/curved time remapping and what is the effect on the audio when making gradual playback speed changes?

The speed/time remapping controls are quite good; here's a clip I made that demonstrates how deep you can go: https://www.instagram.com/reel/CiSoiypPeB2/?stkn=emgyM3N3bHN...

WRT audio I'm not sure as I only did this with audio less drone footage.