I'll use Reaper for this tip
go to http://www.rs-met.com
in the freebies section download the Signal Analyzer and put it into your VST plugins folder.
Load up Reaper. Assign the Signal Analyzer to the master bus, and float it's window by double clicking on it in the FX window
assign TapeBus also to the master section, but before the Signal Analyzer.
create a new Virtual instrument track and assign the REAsynth VSTI to it. Just create a sound with a pure sine wave, reduce the output volume a little so it doesn't clip. Hook up a midi keyboard and hold down a low note.
note the shape in the Signal Analyzer
It's a pure sine wave when TapeBus is bypassed
now turn tape bus on. You'll see extra harmonics added above and below the sine wave fundamental. You can see that these extra low level harmonics move up and down. I guess these are the Tape impulse goodness :)
If you crank up the Rec Gain knob, you'll see bigger upper harmonics spike up. Saturate will make them even bigger/louder and the sound will change even more.
EM gain reduces the level of the harmonics
Play around with the controls and note the changes. It helps a lot
This is handy with the other Voxengo plugins like Warmifier as well! You can see and hear the major differences between the tube/valve types! They all add varying amounts of upper harmonics.
Some are a lot smoother and cleaner sounding than others. Others much harsher and fizzier.
Whoops I forgot you can use
Voxengo Span as well :)
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