[78-L] Juiced Speeds

[mgstill at bellsouth.net]

When was it possible, and on what recordings were speeds ever juiced up (or down) during the 78 era?

I am not considering any variations in playing speed of 78 records; my question is about speed changes made to the original recordings before they were put on discs, for the purpose of making them more commercially viable, or for novelty or experimentation.

Thanks!

Best,
Margaret G. Still