Configure Winamp ASIO plugin to RESAMPLE to 48Khz.
The setting 'Shift Output Channels' - when set to '0' out puts audio via FXBuss 0/1; if set to '2' will output on FXBuss 2/3 etc..
The ASIO plugin I used wha from here:
WINAMP5” ASIO‡Š›ƒ—ƒ‚‚ƒ (dll version) - ŠŸち‚ƒ‚“のMIDI/Audio‚ƒ•ƒˆ
I tested the SSE2 version, in winamp V5.35 and worked.
edit: tho I get some pops/crackles, I may try the non-SSE2 version, as changing buffers in plugin, or kX ASIO control panel doesnt seem to have any effect... this could be from from a poor ASIO plugin - as ASIO works fine in Sonar /edit.