> you need to reverse the RIAA curve to get > back the original signal. Audacity has a built in 'equalization' effect with presets for several disc cutting curves, including RIAA. I'm not sure how you would use it to reverse the curve though - it looks like it was designed to add vinyl/shellac equalisation to digital recordings, rather than remove it from analogue ones recorded without a correcting pre-amp. The alternative for early recordings is to use an old-school pre-amp with analogue settings for the different curves used before RIAA became standard, such as a Leak Varislope: http://home.mira.net/~kiewavly/Leak/VarislopeII_front_a.jpg You need two for stereo, and because most Leak stuff is 'collectable' they are often sold for high prices. They weren't exactly cheap back in the 1950's though. I sold my mono Varislope, and these days I use a Musical Fidelity X-LPS for everything, because I now have a modern pickup cartridge designed for 78s (an Ortofon) as well as another for 33/45s. The sound of the 78s probably isn't http://emedia.leeward.hawaii.edu/frary/x-lp_review.htm These units are discontinued now, and you can pick them up quite cheaply from 'end of line' hi-fi dealers - mine cost ?100. They go for more on eBay than the brand new price, so watch out for that! Cheers Daniel
