Never mind! I worked it out myself
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I don't know anything about the library...
But most turntables don't ramp. Usually speed-up or slow-down is limited by inertia.
DJs usually want high torque and fast-start. And some DJ turntables may have variable speed (more than the typical "speed adjustment") and some DJ turntables can reverse.
Regular listeners usually don't care unless maybe if it takes more than one revolution to reach speed. The main thing is that it plays at the correct speed with no audible wow or flutter.
DJ’s normally use direct drive turntables and, yes, they normally start very quickly. This is a belt-drive and the platter weighs about 2.5kg. The motor has plenty of torque but if it spins up too quickly, the belt will just slip - like a car doing a burnout!
Sounds like you need a belt tensioner.
This thread seems strangely similar to a thread by another person from a week ago or so? Is this a coincidence?
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Finger start, like a DJ.
AccelStepper has an example with adjustable acceleration: AccelStepper/examples/Random/Random.pde at master · adafruit/AccelStepper · GitHub
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