Interesting side point: but
The TACX Training App has a workout option that basically sets up your trainer in ERG mode but provides a graphic readout of stroke by stroke output.
Which sounds kinda dirty, but actually helps the rider smooth their output left/right and up/down if I understand correctly.
Keep the line on the screen level and straight and output is smooth.
Hills and valleys? Not smooth.
It ain’t exciting but it helps if you listen to JJ Cale.
Loud.
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Hard at work in the Secret Underground Laboratory...