Line out to instrument input level attenuation

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This is an easy question but I can't find any easy answer..
I want to connect a rackmount audio effect output (line out)
in a guitar amplifier input (in clean mode).
I read that I should attenuate the line out signal to 1/10
from it's original level to avoid distortion in the guitar amp..
I was thinking of using a 2 resistors attenuator circuit
around 22k & 2.2k in series with incoming signal at
22k and the output tapped at the 2 resistors join
The final 2.2k end is grounded.
Is-it a good ratio to use ?
Thanks.
 
rackmount effects and guitar amp inputs can get along, as long as operating levels and impedances are happy with each other.
some units have provisions for selecting between -10 and +4 db operation (common on many Yamaha rack mount units as well as Roland, Lexicon.Evintide etc)
will your guitar's output level and impedance be sufficient to drive the unit in question?
 
If you don't have output/input level controls on either device (which seems implausible), it might be better to use an audio taper pot so you can adjust the level to your taste. Similarly you could build a simple variable gain op-amp stage to buffer the impedance if necessary.

You probably don't need to do anything. Most modern guitar amps are designed to accept line level outputs from pedals. Not 100% sure, but worth trying first.
But yeah pretty much this. If it's an old amp, then MAYBE you need to resort to an extra device.
 
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