Don't know where should I post it, but I think it is more suitable for ROM Dev forum.
Everyone who tried to record calls on X1 knows that our phone records only YOUR voice,
and you hear your friend's voice badly. Driver posted below fixes this problem.
0) Full backup (use SPB Backup, for example)! I don't take any responsibility for broken phones!
1) Install driverwiz_2wayrecording.cab
After that you'll get "Record" menu item during calls, also you will be able to use third party recorders like Resco Audio Recorder, Vito Audio Notes and so on.
Quality isn't as great as when you record only one line, but it is much better than it was before.
You are free to use this driver in your ROM if:
1) post a link to this topic and write a little patch's description in one of the first posts of your topic.
2) write author's nickname ("ultrashot" )
UPD (5th of september):
Added cab made by DriverWiz util, with it you don't have to install NewSDKCerts.cab, so it means less problems with certificates.
7th of september:
deleted old cab and certs, use only driverwiz created one.