ALSA lib ... Cannot find rate converter

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(First message, hello everyone!)

I can't use the rate_converter option of plug plugin, it gives me this  
error:

"ALSA lib pcm_rate.c:1400:(snd_pcm_rate_open) Cannot find rate converter"

i get this error when trying to launch Alsaplayer from the console,
using this command "alsaplayer -d equalized" (see asoundrc below
for definiton of equalized). I'm on debian testing, all related packages
are up to date. libsamplerate and libasound2-plugins are installed.
related .so files are all checked to be in place.

Here is my .asoundrc file

Note that the mbeq_plugin part works all correctly on it's own. in fact
just commenting the rate_converter line works, of course with only
default resampling.

pcm.equalized {

   type			plug
   slave {
	pcm		"mbeq_plugin"
	rate		48000
   }
   rate_converter	"samplerate_best"
}



pcm.mbeq_plugin {
   type			ladspa
   slave.pcm	"plughw:1,0"
   path			"/usr/lib/ladspa"

   plugins [
     {
       label 	mbeq
       id 	  1197
       input {
		#bands	 [ 50	100	156	220	311	440	622	880	1250	1750	2500	3500	5k	10k	20k	]
		controls [ -6	-4	-3 	-2	0	0	-1	-2	-2	-3	-3	-5	-5	-6	-6 	]
       }
     }
   ]
}

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