On 10/31/2016 05:11 AM, Daniel Schürmann wrote: > Mixxx already offers a digital 44 dB gain, that should be able to boots > the phone level to line level.
I have tried doing exactly what Be suggests. It can work in a pinch, but it's not as reliable. Read on to find out why. > the Serato timecode is just a 1 kHz sine > wave Not quite. The absolute position is present in a higher-frequency component. Simply increasing the gain that much also amplifies the (analog) noise significantly, of which there is much inside a computer (low-quality and integrated sound cards make it worse.) Then the "bit crushing" from so much digital gain introduces quantization noise. Not to mention that the longer the unbalanced phono-level signal from the stylus travels in the physical wires between the turntable and the ADC in the sound card, the greater the chance it has to pick up external noise. (This may be one reason why the phono cables on the original SL-1200 and MK2 were hard-wired: to discourage using longer ones.) All of these noise sources can interfere with the high-frequency part of the time code signal, causing VC to lose absolute position often (and even relative position if any spurious noise is around the frequency of the "carrier" wave of the control signal in use.) And of course pass-through would sound horrible. The inverse RIAA EQ gives an advantage here since it boosts frequencies above 1kHz far less than it does those below. So it might be interesting to try gaining up the signal non-linearly (following the inverse RIAA EQ) in software and see how it performs. But quantization noise would still be present (though you can try shaped dithering, increasing CPU load) so using a phono preamp is still the best practice which is why we recommend it. Sincerely, Sean M. Pappalardo "D.J. Pegasus" Mixxx Developer - Controller Specialist
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