-v is a multiplier. So, -v 0.2 reduces gain to 20% of original. It is typical to supply professionally recorded audio with peaks boosted to 0DBFS. That is probably how the prompts were originally supplied. It makes since that -v 0.2 would reduce the max power to 20%, around -15 to -16 DBFS. The FS build process downloads pre-processed versions of these files. Is there somewhere online that I can find the source recordings+script that produces the pre-processed files that are downloaded by the build process? Bryan On Jun 27, 2011, at 7:32 PM, Michael Collins wrote: On Mon, Jun 27, 2011 at 3:07 PM, Anthony Minessale <anthony.minessale@gmail.com<mailto:anthony.minessale@gmail.com>> wrote: Have a look at the 48khz versions of the files, those should be the originals. Someone runs a batch sox command on them to get them to the other levels. Just for the record, the sox command used to normalize the sounds is: sox -v 0.2 $file_in -r $rate -c 1 $file_out The -v format is the "volume" format and if I read the sox man page correctly it means a "linear amplitude adjustment". What I can't tell from the man page is whether .2 means "reduce by 20%" or "reduce to 20%" or something else. In any case, like Tony says, we are not picky about this as long as it's not pointlessly loud. -MC _______________________________________________ Join us at ClueCon 2011, Aug 9-11, Chicago http://www.cluecon.com 877-7-4ACLUE FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org<mailto:FreeSWITCH-users@lists.freeswitch.org> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org