what does A4 equal when tuned down 1 step?

[xntrick]

i know it is 415.0 Hz when it's a half step but i can't find any info for a full step...

[forestryguy]

Try this chart: http://www.phy.mtu.edu/~suits/notefreqs.html

[AndrewC]

G is 392 Hz

[tiller]

In equal temperament tuning, the change in frequency for x number of semitones is equal to 2^x/12.

So if you wanted to go down two semitones (a step) from 440Hz you would calculate 440*2^(-2/12).

Which would give you 392Hz!