Thanks Rob. That was very interesting.
So I don't know if there's a functional difference between the Covox Speech Thing and the Covox Sound Master (latter is used by the 1.07 version of SimCity).
That may be why SimCity fails to detect Disney as being a Covox when SimCity is configured to use Covox Sound Master.
Are you saying that if this below (lpt_dac = none AND lpt_dac_filter = on) is added to the DOSBox conf file's [speaker] section that it opens up more configuration options for Covox?
That gives me more to experiment with. I assume no hardware is actually necessary or is it?
[speaker]
# lpt_dac: Type of DAC plugged into the parallel port:
# disney: Disney Sound Source.
# covox: Covox Speech Thing.
# ston1: Stereo-on-1 DAC, in stereo up to 30 kHz.
# none/off: Don't use a parallel port DAC (default).
# Possible values: none, disney, covox, ston1, off.
# lpt_dac_filter: Filter for the LPT DAC audio device(s):
# on: Filter the output (default).
# off: Don't filter the output.
# <custom>: Custom filter definition; see 'sb_filter' for details.
lpt_dac = none
lpt_dac_filter = on