For 78s I tend to leave the click setting at 50 and then play around with the crackle slider. Listen to the "noise" output and reduce the click and crackle settings until you only hear noise and no musical indications. You should consult Peter Copeland's Manual of Analogue Sound Restoration for a good summary of correct shellac disc speeds. Also, keep in mind that most 78s weren't actually cut at 78 so you will need to adjust the playback speed at the transfer stage or digitally. With the Eq software you can record flat or through am RIAA preamp and correct the curve as necessary. It is based on the Elberg Md12 multi curve preamp that we use at the National Sound Archive. Again, Brian Davies' EQ software will be really useful if you don't have a 78 friendly preamp. Most electrically recorded discs will have been cut using a variation on the Western Electric curve. The RIAA curve is not to be used with 78s. You Must ensure you are using the correct EQ curve. Here you can also apply high and low pass filters for a more "natural" form of noise reduction. You could use the Stereo>Mono function here, but a better approach would be to use the same developer's EQ software and use the "-" function to select the highest SNR mono section of the groove wall (see the manual for instructions on how to do this). Click to expand.Listen to the "noise" output and reduce the click and crackle settings until you only hear noise and no musical indications.
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