Many thanks for your ideas and help, Eric! I am learning about Linux only for the purposes of my audio hobby, so your last ideas will take some time to digest. One of the attractions of SoX is the ease with which different genres of effects can be combined into a stream. SoX is efficient and simple to use in cases where the input sample frequency is fixed - like USB input from a fixed frequency appliance. However, in my own setup I use a clock-switching Linux kernel for the 'audiophile material' so it is never resampled regardless of it's native frequency. For now I will focus on scripting a detector for a file's native sample rate so that any FIR filtering is done correctly. [I'm only barely fluent in Python :P] Once that works I will revisit SoX to come up with different command lines for each source sample rate. So, timeout for now on the delay question and again, thanks for your ideas. Frank -- View this message in context: http://sox.10957.n7.nabble.com/implementing-loudspeaker-crossovers-using-Sox-LADSPA-plugins-tp5464p5727.html Sent from the SoX mailing list archive at Nabble.com. ------------------------------------------------------------------------------ Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San Francisco, CA to explore cutting-edge tech and listen to tech luminaries present their vision of the future. This family event has something for everyone, including kids. Get more information and register today. http://sdm.link/attshape _______________________________________________ Sox-users mailing list Sox-users@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/sox-users