Step 1: What You Will Need
You will need:
A computer capable of running Audacity (Linux, Windows, or Mac)
Dual Tape Decks Audacity Nyquist Plug-In (dualtapedecks.ny)
Stereo Butterfly (static) Audacity Nyquist Plug-In (buttrfly.ny)
A guitar recording (can be done in Audacity)
Step 2: Installing
Extract the .zip files and make sure that the nyquist file names are in lower case (eg. buttrfly.ny NOT BUTTRFLY.NY)
Copy dualtapedecks.ny and buttrfly.ny into:
/usr/share/audacity/plug-ins/ if you use Linux
C:/Program Files/Audacity/Plug-Ins if you use Windows
Step 3: Preparing the Track
Step 4: Dual Tape Decks
Double-click to select the recording and then click Effect...Plugins 1 to ?...Dual Tape Decks.
I recommend using these settings:
LFO Frequency == 0.1 HZ
Starting Phase == 0 degrees
Phase Difference == 180 degrees
Depth == 0.01
Click OK to apply the effect.
Step 5: Stereo Butterfly (static)
Step 6: Dual Tape Decks (Again)
Re-apply the Dual Tape Decks effect by double-clicking the track to select it then click on Effect...Plugins 1 to ?...Dual Tape Decks. Use the same settings as you used the first time in Step 4.
Step 7: Done
I have attached samples of this effect in MP3 and OGG formats. The OGG version will play directly in Firefox.