[LAD] Half-OT: Fader mapping - was - Ardour MIDI tracer

Fons Adriaensen fons at linuxaudio.org
Mon Aug 25 08:13:28 UTC 2014

On Mon, Aug 25, 2014 at 09:02:34AM +0200, Ralf Mardorf wrote:

> On Sun, 2014-08-24 at 15:25 +0000, Fons Adriaensen wrote:
> > Piezos have a capacitive impedance, together with the preamp resistive
> > input impedance this forms a first order highpass filter. A typical mic
> > input is around 2 kOhms, this would place the cutoff frequency somewhere
> > in the high audio range, with 6 dB/oct below that. Could be EQ'd in theory,
> > but for musical use it's usually better to use a high-Z preamp.
> Have you tested Guitarix? Hermann claims that Guitarix fix such an
> issue, if you know how to handle Guitarix.

And in theory it could, but I don't think Hermann is advising anyone
to use Guitarix to fix a technical issue such as this one. For a piezo
pickup you need the right preamp, either a very high-Z one or a charge
amplifier. Not to create any 'sound' but just to make it work as intended. 

This has nothing at all to do with Guitarix or even tube emulation in
general, so you better stop whining about it.



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