Soulbuster, the reason Ricochet works is because you have the cassette SIO patch selected in acceleration. I can make it work that way even in Altirra 2.50...
Without it selected, I get a bunch of weird noises about 30-36 seconds into loading, depending on the version of Altirra,
I tried cropping your wav file (lead-in and data only) and then redid the cas file. Without the SIO patch, it will load four blocks before a error-143 at line 0 happens.