Raspberry PI / KODI / aktiv Weiche (BruteFIR?)

Code:
faltpc-desktop faltpc # brutefir -nodefault /home/faltpc/.brute48_config

BruteFIR v1.0l (October 2013)                                 (c) Anders Torger

Internal resolution is 32 bit floating point.
SSE capability detected -- optimisation enabled.
Creating 4 FFTW plans of size 65536...finished.
Warning: could not save wisdom:
  could not open "home/faltpc/.brutefir_convolver" for writing: No such file or directory.
Loading 4 coefficient sets...finished.
Realtime priorities are min = 2, usermax = 1, mid = 3 and max = 4.
Estimated CPU clock rate is 1999.999 MHz. CPU count is 4.
Filters in process 0: 0 
Filters in process 1: 1 
Filters in process 2: 2 
Filters in process 3: 3 
Input poll mode activated
Realtime priority 3 set for input process (pid 27375)
Realtime priority 4 set for filter process (pid 27474)
Realtime priority 4 set for filter process (pid 27473)
Realtime priority 4 set for filter process (pid 27475)
Realtime priority 4 set for filter process (pid 27472)
Realtime priority 3 set for output process (pid 27476)
Fixed I/O-delay is 65536 samples
Audio processing starts now
ALSA I/O: underflow! (write on p??)
ALSA I/O: underflow! (write on p??)
ALSA I/O: underflow! (write on p??)
rti: 0.025
peak: 0/0/+nan 1/0/+nan 2/0/+nan 3/0/+nan 
ALSA I/O: underflow! (write on p??)
rti: 0.023
ALSA I/O: underflow! (write on p??)
ALSA I/O: underflow! (write on p??)
rti: 0.024
peak: 0/0/+nan 1/0/+nan 2/0/+nan 3/0/+nan 
ALSA I/O: underflow! (write on p??)
rti: 0.027
ALSA I/O: underflow! (write on p??)
ALSA I/O: overflow! (read on ?V?)
ALSA I/O: Could not restart audio: Broken pipe.
I/O module failed to read, aborting.