I just bought the alpha (Humble Voxatron Debut) and I can't get any sounds to work.
Oddly, I see sound activity in the sound mixer but can't actually hear anything.

Edit: Problem solved and lesson learned: drivers from windows update don't actually work.

There must be someone else with this issue.

I've the same problem too. No sound at all (windows 7 x64)

log.txt
codo_init
Found config.txt

01 video_mode 1920 1080 32
02 windowed 0
03 force_32 1
04 go_easy 0
05 sound 1
06 sound_volume 256
07 music_volume 256
08 mix_buffer_size 1024
09 windib 0
10 opengl_blit 0
11 show_fps 0
12 large_window 0
13 version V0.1.3
14 ff_version 2
15 dummy 0
16 current_player 1
17 path 
18 super_sample 0
19 soft_shadows 0

codo_system_init
SDL version 1.2.14
codo_reset_timer
codo_gui_init
codo_keys_init
codo_text_init
codo_gfx_init
opengl_blit not supported
retrieving video information
stored desktop resolution: 1920 1080 32
ok
codo_set_screen 1920 1080 32 11
succeeded at 1920 1080 32 1
codo_sound_init
SDL_INIT_AUDIO ok
SDL_OpenAudio ok
codo_joystick_init
found 0 joystick(s)
ok
codo_load_pod_set: C:/Program Files (x86)/Voxatron/vox.dat ok
generated sounds: 3397ms
instruments: 13
codo_exit
cmusic_stop
exit_func
codo_config_save
codo_sound_exit
codo_gfx_exit
return to desktop resolution: 1920 1080 32
codo_joystick_exit
codo_system_exit
codo_items_created: 396
ok

====================

config.txt

video_mode 1920 1080 32
windowed 0
force_32 1
go_easy 0
sound 1
sound_volume 256
music_volume 256
mix_buffer_size 1024
windib 0
opengl_blit 0
show_fps 0
large_window 0
version V0.1.3
ff_version 2
dummy 0
current_player 1
path
super_sample 0
soft_shadows 0

Well, at least it's not just me.

You were right dorino, it was my audio driver.
Never letting windows update handle drivers again.