I just discovered, by browsing through the sourcecode, you can tell alsaequal to use Eq10 instead of Eq.
You would have to ad a "module" to the asound.conf. My asound.conf now looks like this:
Note that I added the module line twice.
But now I encounter a different, move vague problem. And the last time I did some programming in C is about 15 years ago...
(it's Java an C# I am using now)
So, understanding the code is a bit time consuming.
The error message I have now is:
ALSA lib ctl_equal.c:268:(_snd_ctl_equal_open) Problem with control file .alsaequal.bin, 3.
cannot open mixer: Operation not permitted
Sidenote: I also notice one can set the path to caps.so in the asound.conf. Might be usefull too.