The problem with the Speakup boot disk is that it uses a kernel with multiprocessor support and the other kernels are single processor. The modules that install with Slackware assume the single processor kernels. If you don't want to compile a new kernel, the easiest way is to copy the modules from the contrib CD in the directory modules/2.2.19-smp over the existing /lib/modules/2.2.19 ones. That's what I did and then I compiled myself a custom kernel. Hope this helps.
