The audio was setup using the prescribed method, without the "MK-1 calibrated ear." If we raised the rx level, and reduced the tx level, then we'd have difficulty hearing the station id. I suspect the level of our custom recordings is too high, an I was trying to avoid the brute force method of redoing each one.
Thanks, Bob kk6ecm
Record level is tricky in Asterisk. When seen on any editing program, "full scale" is -6 dB f.s. or 0.5 on the voltage scale. I suspect the reason for this is that uLaw only produces about 14 bits when converted to linear and that is what asterisk expects for full scale. (I guess losing those two bits is equivalent to dividing by four or 6 dB down). Have a look at some of the Allison GSM files by importing them into Audacity and you will see the max level is 0.5. Even this is too loud for most people (as newbie postings have indicated many times). I think a reasonable level is 3 dB down from full scale - in other words, minus 9 dB relative to full scale (!) or about 0.3 on the voltage scale. Ref: http://images.ohnosec.org/app-rpt-audacity.pdf Regards Ken KE2N