If your turntable does not have a strobe or speed adjustment, you can measure the playback speed in revolutions per minute (rpm) very accurately thus: See Playback equalization for 78 rpm shellacs and early 33\xe2\x85\x93 LPs in the Audacity Wiki for a list of known equalizations used by different manufacturers of 78 rpm records. In practice, many different equalizations were used according to the record label or even the recording engineer. This will cancel out the unwanted RIAA equalization, after which you can apply one of the 78 rpm playback curve presets supplied with the effect. So, to make a fully professional job of transferring your 78 rpm records, you should open Effect > Filter Curve EQ or Effect > Graphic EQ in Audacity immediately after recording, and apply the inverse of the RIAA playback curve (see the next section). They therefore sound dull if played through modern equipment that applies RIAA playback equalization. The problem is that most 78 rpm records were not cut with such a strong high frequency bias. This equalization is essential when playing records made from the 1950s or later, as it cancels out the high frequency biased "RIAA recording equalization" that such records are cut with, making them sound normal again. This is because the pre-amplification not only provides the necessary amplification for the cartridge signal that is sent to Audacity, but applies what is known as "RIAA playback equalization" to it. When recording 78 rpm records, there is a problem that the pre-amplification built into any consumer-level pre-amplifier or USB turntable will be designed for vinyl records made from the 1950s onwards. Backup (you do not want to lose all this valuable work).Review and Export as WAV, MP3 or whatever.Volume adjustments - normalization and compression.
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