Recording on a phone line

[drcharles]

I'm a journalist and am using Audacity to record from a VoiP phone line through agriffin imic preamp to usb port of my iMac. I find audacity to be the best audio software out there. But I notice that there is still a fair amount of hum on the recording. DO you have any simple advice to help solve this problem? The hum is definitely not on the phone line. Do you have a tutorial on removing unwanteed hum from recordings? I'm pretty non-technical, but if you could tell me which effects to use and in what order perhaps i can figure it out. Another dumb question: the vu meters show recording in both channels during recording, but when I play back the MP3 only have right channel sound. Can I easily fix that so I have two channel playback? many thanks

[Trebor]

I notice that there is still a fair amount of hum on the recording. DO you have any simple advice to help solve this problem? The hum is definitely not on the phone line. Do you have a tutorial on removing unwanteed hum from recordings?

My mains hum remover plug-in here ... http://forum.audacityteam.org/viewtopic ... 652#p59652

Steve's mains hum remover plug-in (more controllable than mine) here ... http://forum.audacityteam.org/viewtopic ... 907#p79907

It is better to prevent the hum in the first place than trying to remove it afterwards: processing creates artifacts like ringing.