Changing speed of recording, using previous recordings

  1. I believe there is a way in Audacity to record a 78 at 33 or 45 and change the speed. Its probably in the instruction manual, but who keeps those?

  2. When I try to open previously burned tracks from other software, all I hear in Audacity is a very brief “blip.” What settings or formats do I need to change, and how do I do it?

The manual is here: no need to keep it on file!

  1. Look here:

  2. What format of file are you trying to open? Seems like it’s one Audacity can’t decode.

Oh, yes … what version of Audacity are you using, and what what computer and OS?

– Bill

I have Audacity 1.2.6 running on an HP Media Center computer with Windows Vista. The Audacity software came on a CD with an Ion turntable I purchased that only runs at 33 and 45. The turntable connects via RCA plugs to a DAK 2800-PC fader, which feeds into the computer. I do not use the turntable’s USB connection capability.

I’d strongly recommend downloading the latest version (1.3.9) from

Then the manual I referenced in my previous post will make sense. If you really want to continue using 1.2.6, the manual is here

For transcribing 78’s you really need a special stylus (needle). A “normal” stylus will bottom out in the larger grooves on a 78. Check the cartridge that came with the Ion to see if there is a 78 rpm stylus available. Otherwise, Stanton has 78 rpm stylii available for several of their cartridges:

Also have a look at this page:
Scroll down to “Special note on 78 rpm transfers”. This page in the manual is still a work in progress and some links are broken, but it makes the point: you need to “undo” the RIAA equalization that is applied when playing back the 78 at 45 rpm by drawing the reverse of the RIAA curve in the Equalization effect. Then you need to change the speed. Then you need to apply the appropriate 78 rpm equalization pre-set in the Equalizer effect.

Hope this helps. I still have no idea what is causing your second problem. What is the file extension of the tracks burned from other software that you are trying to bring into Audacity?

– Bill

The problem is with .wma files … which apparently aren’t supported by Audacity. .mp3 files work fine, so it must simply be the fact that .wma must be converted to a compatable file type.

please, re-draw the RIAA curve?

isn’t it sufficient to just copy the RIAA curve info from EQpresets.xml and change the sign on the d values? i.e.:

	<curve name="Reverse RIAA">
		<point f="30.000000000000" d="-18.600000381470"/>
		<point f="31.000000000000" d="-18.500000000000"/>
		<point f="50.000000000000" d="-16.899999618530"/>
		<point f="63.000000000000" d="-15.899999618530"/>
		<point f="70.000000000000" d="-15.300000190735"/>
		<point f="100.000000000000" d="-13.100000381470"/>
		<point f="125.000000000000" d="-11.600000381470"/>
		<point f="200.000000000000" d="-8.199999809265"/>
		<point f="250.000000000000" d="-6.699999809265"/>
		<point f="300.000000000000" d="-5.500000000000"/>
		<point f="400.000000000000" d="-3.799999952316"/>
		<point f="500.000000000000" d="-2.599999904633"/>
		<point f="600.000000000000" d="-1.799999952316"/>
		<point f="700.000000000000" d="-1.200000047684"/>
		<point f="800.000000000000" d="-0.800000011921"/>
		<point f="900.000000000000" d="-0.300000011921"/>
		<point f="1000.000000000000" d="-0.000000000000"/>
		<point f="2000.000000000000" d="2.599999904633"/>
		<point f="3000.000000000000" d="4.699999809265"/>
		<point f="4000.000000000000" d="6.599999904633"/>
		<point f="5000.000000000000" d="8.199999809265"/>
		<point f="6000.000000000000" d="9.600000381470"/>
		<point f="7000.000000000000" d="10.800000190735"/>
		<point f="8000.000000000000" d="11.899999618530"/>
		<point f="9000.000000000000" d="12.899999618530"/>
		<point f="10000.000000000000" d="13.699999809265"/>
		<point f="15000.000000000000" d="17.200000762939"/>
		<point f="16000.000000000000" d="17.700000762939"/>

And if you don’t use a special; stylus designed for 78s thaen you are extremely likely to not only get very poor sound from the bottom of the groove - but you are also likely to damage the stylus that was designed for the smaller grooves designed for vinyl 45s and 33s as it bumps and grinds along the bottom of the 78 track.

IIRC ION can supply a stylus suitable for 78s


Yep, that’s the way to do it.

– Bill

unfortunately, it is difficult to exactly reverse the RIAA curve used in one’s pre-amp, as the curve in audacity is only an approximation. so, there is some inaccuracy here. thus, i have tried to record without using my pre-amp and, naturally, the signal is very low. after applying the correct EQ in audacity, the signal can be amplified more than 40 dB. once this has been done, i am noticing a very loud electrical hum, kind of like a grounding issue, even though the table is still grounded to the pre-amp. perhaps the pre-amp uses the ground as some sort of reference and thus eliminates the hum, so removing the pre-amp from the signal chain re-introduces some hum?