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RE: Jitter and music software-Programming?

Hey Fred,

Nothing wrong with following a recipe. No blind faith needed. YOu are testing it!

Here is an explanation of cmp and some of the things it does.

Several replacement shells have been written over the years,most of which aim to reduce Explorer’s overheads and/or change its appearance. cMP is a replacement for Explorer that aims to maximise the quality of audio reproduction by reducing the runtime ‘footprint’ and thus motherboard activity in general.It allows the host processor to be underclocked and undervolted,lowering RF noise and power consumption.These measures significantly reduce jitter on the audio output. On launch,cMP:

- disables the ‘Welcome’screen and its associated bloat;
- stops the Taskbar process;
- makes several low-level ‘runtime’configuration changes which cannot readily be made by other means.Some are made when cMP is launched,others,such as the suspension of svchost and/or lsass,when a suitable music player is launched by cMP;
- optimises the L1 Data & Instruction cache for audio.On a multi-processor platform, the Optimise > Critical setting locks the most critical audio thread to CPU1. Although the load on this is insignificant,the setting removes need for a real-time operating system;
- frees up RAM,making a one GB module enough to hold a 75-minute CD under cPlay;
- provides facilities for a touchscreen,remote control and library management.


And other things are part of the overall recipe. First off cmp is a simple gui, which IMHO one really needs for cplay. If you are using cplay, then you have little functionality outside of cmp. They need to go together.

Here is just one optimization of the many:

Step 5 – Disable audio devices
Select the Drivers tab. Several audio components can safely be disabled. Some experimenting is needed but the following are generally safe: aec (acoustics echo canceller);DMusic (synthesizer);drmkaud (descrambler);kmixer (at last!);redbook (filter) and splitter.

- Different soundcard setups respond to these changes in different ways.(Disabling kmixer is known to disable one make ofUSBDAC).It is advised that they are made one at a time and that the system is tested after each one.


And you mention the video. DO you have yours downgraded as one would on a cmp2 box? Here is just one of the 5 video tweaks:

Set the video mode LCD and plasma displays have a ‘native’resolution. LCD displays are typically 1280 x 1024 though plasmas and widescreen LCDs will differ. Noise injected by a display into the mains can be audible in a high-resolution system; the main offender is the display processor which is the device that detects the input resolution and scales it to the native resolution. Selecting the native resolution bypasses the processor and offers video quality obtained. Using using a low colour depth reduces the CPU load.
Determine the monitor’s default resolution from its documentation,select
Control Panel > Display > Settings and set the resolution to the native resolution,go to Advanced > Adapter, click List all modes and select 256 Colors, Default Refresh. Recyle mains power on the computer to effect the change – a reboot is not enough.


For example, there is no need to disable half the services as cics suggests as they do not run when only audio is playing. I therefore do not work on blind faith along the lines of mumble jumble.

This is just silly. It is a big assumption on your part. Kind of like a zillionaire saying they only have to worry about all there houses around the world when they are actually there. Someone has to keep track of the houses to know where they are, etc. That is an extra distraction. If you don't have the houses then no distraction.

YOu have nothing to loose by disabling then on a dedicated machine (weird you now have 2 of them when a few weeks ago you said you didnt). DO you really need the printer spooler running? And Fred it isnt mumbo jumbo if it works...

And Fred one really needs a dual core processor for maximum gains of cmp.


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