Coupling capacitor question

[DavenPaget]

Mylar is OK.  Monolithic is another name for ceramic and large-value ceramic capacitors will distort sound because they act as piezoelectric transducers as well as capacitors.  Instead of voltage in = voltage out for a coupling application, you may get voltage in = bending of ceramic + voltage out.  You may also get some susceptibility to external acoustic noise which may give you a rather strange feedback mechanism that varies with pedal position.  A guide to capacitor linearity is here:

http://greygum.net/sbench/sbench102/caps.html

and

http://greygum.net/sbench/sbench102/caps2.html

That's why my stratoblaster was giving me extra feedback , IN MY GUITAR CAVITY !
Those assholes at my local store sold me a $2(!) monolithic 1.5uf ceramic because tants costs like ... 5$ ... but oh well no more buying from them since i became a asshole and took my revenge on them , by stealing many 1.5ufs tants  

[alparent]

Thanks guys!