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You should change this in the backend you're using.

If you are using amarok with the gstreamer-engine, you may specify the sound device to be used. Just check the box an enter the sound device to be used, for example /dev/dsp1.
I don't know how to configure xine to use /dev/dsp1, but I will tell you as soon as I find out how to do it.

I thought a screenshot might perhaps help you. Here it is:

Here is the solution if you are using amarok with the xine-engine:
First, you have to change "Ausgabe-Modul" (see screenshot, I don't kown how it is called in english) from "auto" to a specific driver. I chose "oss" for the screenshot.
Then you have to select the desired sound device. I could only change between /dev/dsp and /dev/sound/dsp. I have to soundcards, /dev/dsp and /dev/dsp1. So I created the directory /dev/sound an created a symbolic link /dev/sound/dsp, pointing to /dev/dsp1. I had to restart amarok, then it worked properly.

And here is the solution if you are using kaffeine with the xine-engine:
You have to configure the "xine engine parameters". Find the options for "audio" and set the driver to be uesd from "auto" to "oss". Save the setting and restart kaffeine (the config-file has to be re-read). Open the configuration dialog for the xine engine parameters and find "device.oss_device_name". Set it to "/dev/sound/dsp" and do not forget that you probably need a symbolic link /dev/sound/dsp pointing to /dev/dsp1.
This worked fine for me, but, dependig on your distribution, you may have different entries in /dev.
Good luck, I attached two screenshots to make life easier. (Your kaffeine may look different, I am using the current svn-version.)