Where did you get the hidden|true command from? Maybe there are others?
There was a readMe file in the plugin installer zip (npmod191.zip) that I downloaded. The bit concerning commands reads:
The other options you may want to add are the following:
- volume="x": set the volume of the song to x.
(Default="100", range="1" to "100")
- loop="true": Loop the song. (Default:"false")
- autostart="true": Start playing the song when loaded.
(Default="false"). (Also "autoplay" on versions 1.31+)
- autonext="true": Jump to next mod when finished playing.
(Default="false") This is useful only if you have more
than one song in your page. (You should use loop="true"
instead to make the same song loop)
- controls="none"/"stereo":
* "none": don't display anything - use with care
because there is no way the user will be able to stop the
mod (besides exiting the page). (same as "hidden="true")
* "stereo"(1.65+): the horizontal spectrum analyzer will
be split for right/left, on each side of the plugin.
In this case the number of bands will be (width - 184) / 16.
NOTE (1.75+): The option controls="smallconsole" has been
removed, it's now automatic if height < 20.
- hidden="true": same as controls="none".
- title="song_title": Displays the text "song_title" when
the song is not yet loaded. (Default: displays "Loading...")
- shuffle="true" (1.57+): goes along with autonext="true".
when a song finishes playing, the next song will be randomly
chosen. The shuffle option is a global flag and should appear
on the first EMBED section in the page. This flags sets
the autonext="true" flag automatically.
- bgcolor="black"(default),"gray" (1.60+): Select a background color
for the plugin.
v1.75+: you can specify a color like bgcolor="#RRGGBB".
- spcolor="red"(default),"green","blue" (1.61+): Select the color of
the spectrum analyzer.
v1.75+: you can specify a color like spcolor="#RRGGBB".
- vucolor="color1", vucolorhi="color2" (1.75+): you can now change
the color of the VU-meter. The default for vucolor is green, and
is red for vucolorhi.
- spcolorhi: defines the top-color of the spectrum analyzer (1.75+).
The default color is red. The middle color will be the mix between
spcolor and spcolorhi.
NOTE: (v1.43+)
--------------
- If you want to enable the VU-Meter, the width parameter
should be set to "168". The VU-Meter cannot be used with
the controls="smallconsole" option.
- If the plugin is hidden (with controls="none" or hidden commands),
autostart will be set to "true".
Spectrum Analyzer (1.60+)
-------------------------
- You can enable the spectrum analyzer by setting a height
of 96 (bottom spectrum) or a width of 336 (right spectrum).
- v1.61+: You can have from 3 to 80 bands in your right spectrum
analyzer: set the width parameter to 176+(numbands*8).
The frequency range is between 86Hz (left) and 11KHz (right).
- v1.65+: With the stereo spectrum, the number of bands on each
side will be (width - 184) / 16.
There's also a MPSNDSYS.H file in the sdk zip - I *guess* we're supposed to use that and the sdk dll (MPPSDK.DLL) for adding modplug playback to our own apps. Nobody on the forums seemed able to confirm when I looked, and a couple of people were asking.