National has stereo dc volume control chips that could be used as a preamp for a gainclone
http://cache.national.com/ds/LM/LM4756.pdf
http://cache.national.com/ds/LM/LM4952.pdf
http://cache.national.com/ds/LM/LM4756.pdf
http://cache.national.com/ds/LM/LM4952.pdf