This section is the most important one for using OPENCP. If you want to change
the configuration permanently you have to modify the entries of this section.
[sound] ; default sound section
playerdevices=devpWSS devpEWS devpSB devpESS devpGUS devpPAS \
devpNone devpDisk devpMPx
samplerdevices=devsWSS devsSB devsGUS devsNone
wavetabledevices=devwMixQ devwIW devwGUS devwSB32 devwDGUS \
- OPENCP uses three different devices to communicate with the
hardware. The playerdevices are used to play a stream of samples. As
all sound cards support this feature you will find playerdevices for
every sound card supported by OPENCP. This device is needed for playing
.wav and .mp3 files and if you want/have to use the software
(quality) mixer. OPENCP searches for all devices listed in this option at
startup and only those found are actually loaded. You can delete all devices
you have not installed to speed up to startup procedure. If you have multiple
sound cards installed be sure to list all devices if you want to use more than
one sound card.6.5. If more than one
device is listed the first in the list will be used as default.
- these devices are the least important ones. They are
only needed if you want to use OPENCP when playing cd audio tracks or start the
player in sample mode. The sample data is not calculated from files, but
sampled from either the cd, line or microphone jack of the sound card. You
can then use the graphical screens to view the sounds.
- for mixing several channels you have to use
wavetabledevices. Most sound cards are only able to play to channels
simultaniously normally assigned to the left and right channel or your home
stereo. The mixer devices are used to mix the sample data of module
files to those two channels. However modern sound cards have special hardware
to mix channels ''onboard''. But all hardware mixers have a maximum amount of
channels to mix6.6. Especially .it files
often use more than 32 channels so an errorfree playback can not be guaranteed
when using hardware mixing. You should include one of the software mixers for
- play .mp3 files only mono. This might be necessary
if you don't have the latest generation of Intel processors.
- the highest playback sample rate to use for .mp3
- the default mixrate. Unless you have a very old sound
a very old processor6.8 there is no need to change
- if you have a slow cpu6.9 you might not be
able to play 32 channels at full mixrate. This value defines the maximum
''calculation power'' to which OPENCP tries to use the full mixrate.
- Leave this option enables unless you have a 8bit sound card.
- dito for stereo cards
- When using a playerdevice to play sample streams a DMA
buffer is used to minimize cpu resources for handling the sample stream. This
option sets the DMA buffer length in miliseconds.
- When running OPENCP in a multitasking environment there is no
guarantee for constant cpu resources. To avoid a break in the sample stream
OPENCP will calculate in advance. This option sets the buffer lenth in
- When using a samplerdevice this value will be used.
- this options sets the length of the sample DMA buffer in
- with this option you can override the default
playerdevice. Normally you don't need to set this option, as the
default device can also be set by the order in the playerdevice option.
This option can also be specified by using the -sp options from command
- this option sets the default wavetabledevice. Can
also be set with -sw command.
- the same as the -ss command line option.
- unlike the module file types the MIDI file format does not
specify the exact amount of channles to use. Complex .mid files can
easily try to play several dozens of channels simultaniously. This option sets
the maximum amount of channels to mix when playing .mid files. Note
that this value has no effect when a hardware mixing device is used, as the
maximum number is limited by the hardware.
- the .it format can play more than one sample per channel
simultaniously. A maximum number of channels to mix is required for this
file type too. When playing .it files using a hardware mixer the
maximum number of channels is again limited to the hardware.
- If you select a .cda file the cd input of your
sound card is used to sample the current music. If you do not have a cd input
or if you have connected your cd-rom to the line-in jack enable this option
to change to sample input.
- This option is os interest for users of hardware mixing
devices only. Sound cards capable of mixing channels are not only limited by
the amount of channels played simultaniously, but by the amount of onboard
memory to store the sample data too. If files are marked as ''big'' in the
fileselector this device listed in this option will be used for mixing this
- When playing a mono wave the sound card can either be
switched to mono mode or the wave can be played as a stereo file.6.11
- if the sample rate of the wave file is not equal to
a sample rate supported by your sound card, OPENCP will not resample unless this
value is exceeded. Divide the value by 1000 to get the percentage.
- the default amplification to use within the player. The following
options are described in section 4.1 in detail. The command line
option -va overrides this option.
- the default panning (command -vp)
- the default volume (command -vv)
- the default balance (command -vb)
- some sound cards have an onboard effect processor6.12 which features a reverb effect. This
option controls the intensity of the onboard effect. (command -vr)
- dito as reverb (command -vc)
- this options controls the fake surround effect6.13 (command -vs)
- The software mixer can use a software filter to enhance the
playback quality. Different algorithms can be used. (command -vf)
- no filter
- AOI - only filter samples when filtering is necessary
- FOI - filter every sample even if filtering has no effect
- ... card.6.5
- you can change devices by using the special
@: drive described in section 3.2
- ... mix6.6
- mostly 32 channels
- SoundBlaster 1.x or SoundBlaster Pro and compatibles
- ... processor6.8
- Something like 386SX
- ... cpu6.9
- See section 3.3 on page for
details about this feature
- ... file.6.11
the soundcard may cause problems so enable this option.
- ... processor6.12
the SoundBlasterAWE and the TerraTecEWS
- ... effect6.13
has little to do with real Dolby Surround although there should be a certain
effect if you have such an amplifier
documentation by doj - homepage www.cubic.org