So I got all inspired & started by looking for any F2K updates. I uninstalled my 1.52 & installed the newest 2.0. Then I went looking for the foo_dsp MCH upmixer. When I tried to add it to foobar components I got an error message to the effect: could not install. This component was meant for a different CPU architecture.You can use the Convert function (right-click on a track inside Foobar2000) to apply any DSP or combinations of DSPs, including FreeSurround, and save the resulting multichannel file as WAV or FLAC (or Apple Lossless if you install a free add-on codec pack). This can be a very effective way to convert matrix quad/surround files for playback on a surround system that lacks a built-in surround decoder.
A little digging I think that means the 32 bit F2K and I'm on a Win 10 64bit and I guess the v2.0 is too.
I still have version 1.52 on my big AV PC downstairs probably installed in the x86 folder. I'll try it there next. But it would be better to find the foobar upmixer in a newer plug in that works with 64. I've checked the F2K components page & elsewhere & can't find a replacement. Any suggestions Foobar experts? Thanks!