Hola!
The subject basically says it all.  Since the hdspmixer
app is still graphical only, and I was sort of pissed with
the syntax I had to use to make amixer set the RME matrix mixer,
I wrote some convinience functions for Emacs.
Now, I have nicely named channels (with prompting) and can
use dB instead of integers in the range of 0-65535 to
set the hardware mixer of the RME.
Still missing however is an additional mapping for double-speed
mode, I didn't need that yet, but I will write it as soon
as I need it...
Get it here: 
http://delysid.org/emacs/rme.el
--
CYa,
  Mario | Debian Developer <URL:http://debian.org/>
  .''`. | Get my public key via finger mlang(a)db.debian.org
 : :' : | 1024D/7FC1A0854909BCCDBE6C102DDFFC022A6B113E44
 `. `'
   `-