Getting the sound to work in Puppy 4.0 was a nightmare. The Alsa wizard didn't work and I couldn't find a reference to it on the forum, so I tried to look in the BIOS. After dozens of reboots and every key combination I could think of I had to give up.
It seems the BIOS setup is on a partition on the hard disk. I went to the compaq website, and found I could download a floppy image of the BIOS setup, unfortunately my laptop has no floppy drive. B***er.
Luckily, there was a white paper on installing Linux on this laptop, which says the Armada used a ESS1879 sound chip and what its default setup values were.
I added
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pnpbios=off
then I added
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modprobe snd_es18xx isapnp=0 port=0x220 mpu_port=0x330 dma1=1 irq=5
After a reboot, I had sound!
(MODS - sorry if I posted this in the wrong place, feel free to move it)