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It is important to understand that Forte, as a VST host, is part of a performance system that also includes your choice of PC, OS, plugins, and audio/MIDI interfaces. Brainspawn does not offer system integration services. Instead we have developed a number of tools to assist you in integrating a performance-ready system.


When assembling a performance rig, please use these tools to build confidence in your system.


Stress Test (Tools Menu)


The stress test tool in the Tools menu exercises your rig by simulating MIDI input and performing scene changes. You can configure the stress test to perform various operations and leave it running for hours. You can also pump more MIDI into your system via stress than you could ever by simply playing a keyboard.


If your live rig can survive indefinite amounts of stress, that is a good confidence builder. However, it is not any sort of "certification" of reliability. The primary value in the stress test is if it fails. If it fails (either a hang, or dropouts, or a crash, or a blue-screen, it positively indicates that a component of your system is not durable.


Be sure to turn your audio inputs down during stress tests. The output is decidedly not very musical!


See Stress Test



Diagnostics Display Shows You Audio Dropouts and MIDI Activity (Tools Menu)


Use the Diagnostics display in the Tools menu to see a count of audio dropouts as well as total MIDI events in or out. Use this during a stress test. If you see the audio dropout counter incrementing, its a sign that something in the system is choking occasionally. This many not always be a big deal. It depends upon when the dropouts occur and your own particular usage.  See Diagnostics Display.



Memory Display Shows Available Memory (Tools Menu)


Use the Memory display on the Tools menu to see how much usable memory you have.


On 32 bit versions of Windows with 4GB of RAM, it is normal to see usable memory of only about 1500MB or so on an empty rack. The reason for this is that 32 bit Windows by default give each application only 2GB of memory. It is not a problem with Forte. About 500MB of that is loaded with the application and a large number of Windows DLL components. It is possible, using the /3GB switch in BOOT.INI (search the Microsoft support site for specifics) to allocate 3GB to each application.


See Memory Information.



DPC Latency Checker Shows Device Driver Behavior


DPC Latency Checker is not a Brainspawn tool. It is a free download from Run this tool and verify you can get "green" results. This indicates your OS drivers are behaving well for real-time audio. Use this in combination with the Diagnostics display and the Stress test.


Another tool recently recommended is "LatencyMon" at



Safe Mode is Useful for Narrowing Down Problem Plugins


Start Forte in Safe Mode by holding down the left CTRL key while clicking on the icon. You will be given the opportunity to "exclude" certain plugins from this run of Forte. If you load a rack with plugins excluded, they will be replaced by proxies (which are just internal placeholders). By excluding plugins, you can narrow down problems to specific plugins.


REMEMBER: In safe mode, the rack is not automatically enabled for streaming - you must press the rack power button to start



Configuration Manifests Show You What Changed (Tools Menu)


Problem: A rack file once worked perfectly on your PC, but now it doesn't, or you've moved it to another PC and it doesn't work.


Use a configuration manifest to help diagnose the changes in your setup that may be affecting your Forte rig. Here's how:

Once your rack is working the way you want it to, select the new Tools menu item "Create Installation/Configuration Manifest"

Answer "Yes" when asked to embed the manifest in your rack file. The next time you save your rack file, the manifest will be contained within it.

A manifest is a snapshot of your configuration containing:

oA record of every DLL module (VST plugins, ASIO drivers, Windows components, 3rd party components) and its version

oKey configuration settings from OPTION.INI

When you have a problem, select the new Tools menu item "Validate Against Manifest" to create a difference report in your Windows clipboard. This can then be pasted into Notepad or other text editor to view.

The difference report contains:

oA list of manifest items missing from the current configuration (e.g. DLLs)

oA list of manifest items in your current configuration that are not in the manifest

oAny manifest items that are different (e.g. DLL versions are different)

oMatching items


You may also copy the embedded manifest to the clipboard for examination with Tools|Copy Manifest to Clipboard, and delete the current manifest with Tools|Clear Manifest.


See Configuration Manifests


Common Advice for Plugin Problems


Use Single Threaded Mode (Preferences Menu)


Forte uses different threads for different plugins, and sometimes plugins cannot handle this. Go into preferences and uncheck "Use all available CPUs" and restart Forte. This will use only one CPU core/thread for all streaming. You will waste CPU capacity, but it has been known to help with some plugins.


Use "Disconnect on Scene Change" (Scene Commands Tab)


Scene changes can be complicated times for plugins. Right in the middle of processing both audio and MIDI, they are asked to completely reconfigure their sound. A Scene change typically causes a new VST "chunk" (FXB or FXP data block) to be downloaded into the plugin. Some plugins have a hard time with this. Try disconnecting the plugin during scene changes. On the Scene Commands tab of the plugin console, check the "Disconnect this instrument when loading configuration data." box.


Don't Download new plugin data on Scene Change (Scene Commands Tab)


You can also check the box "Do not use per-scene configuration data" to avoid having a new VST chunk downloaded during a scene change. This is especially recommended for sampler plugins. In this case, the plugin will remain configured the same during the entire set, but you can send program changes to it on scene change. This is much more light-weight. All this is configured on the Scene Commands tab.


Run Forte in Administrator Mode


Some plugins can't be discovered or don't behave correctly on Windows Vista or Windows 7 unless Forte is running with Administrator privileges. Right click on the Forte shortcut and configure it to always run as administrator.


Change the Device Compatibility file


Forte tries to make a good decision about how to get and set VST configuration (chunks or FXB/FXP data). However, sometimes a plugin wants something different to get or set its entire state. Forte has a way to override scene capture and recall behavior for individual plugins. A file called "DeviceCompatibility.xml" in the install directory contains plugin-specific settings which can override the default behavior. Plugins are referenced in this file by either CLSID or VST ID. If your favorite plugin does not correctly restore its settings on scene change, add it to this file. Note that this MUST be a valid XML file in order for the feature to work.  See Plugin Compatibility Fixes (DeviceCompatibility.xml).



Diagnosing Crashes and Freezes


Forte Crashes


Forte crashes are usually accompanied by an offer to submit a crash report. Please do so if at all possible. Crash dump files are essential to finding and fixing crashes within the Forte application itself.


Plugin-caused Crashes


If a crash happens within a VST plugin, you will usually get a VST crash handler, which displays: Forte version Plugin version Plugin vendor (if known) The action Forte was attempting with the plugin when the crash occurred Please report this to the plugin vendor first. If the plugin vendor believes this is a Forte issue, have them contact Brainspawn.


If the plugin-crash occurs during Scene change or plugin data load, you may also use the SingleStepVSTPluginLoad troubleshooting option to narrow down the specific data that is causing the crash.  See OPTIONS.INI File for details.


If a plugin crashes during scene capture or update, you may try settings StopAudioDuringSceneCapture = 1 in OPTIONS.INI.


Blue Screen Crashes


Blue Screens are ALWAYS a result of a defective device driver. Typically this will be an audio driver, a MIDI driver, or a software protection device driver.




If Forte freezes during an operation, work to identify if the condition can be consistently reproduced, then try the following Start in Safe Mode (launch Forte while holding down the left CTRL key) and exclude some of the plugins - reload the rack file and see if the hang can be reproduced. Retry as necessary until you narrow the hang to a specific plugin. Start Task Manager (or Process Explorer at and see if the CPUs are 100% busy. Open the Diagnostics display in the Tools menu and see if the dropout count in increasing during the freeze. Make sure you don't have a MIDI feedback loop




Forte Log File


Forte maintains a log file that has adjustable levels of output. It is located in your application data directory under brainspawn forte. You can also conveniently access it using the menu command Tools|Log File|View... which will open it in notepad. You can adjust the output levels in Preferences Logging Level. The levels are Silent, Errors (default), Warnings, or Information.


If you are having a problem finding an audio driver or plugin, or any other type of startup problem, you can sometimes find useful information in the log file. Sometimes you will need to adjust preferences to change the logging level to Information, and restart Forte before viewing the log. The log will contain detailed information about what Forte did during startup.



Using 3GB with 32 bit Windows


It is possible to increase the amount of virtual memory Windows allocates to user programs such as Forte.  By default Windows allocates up to 2GB of virtual memory for each running application.


If you are running Windows XP, use the /3GB switch in BOOT.INI (search the Microsoft support site for specifics) to allocate 3GB to each application.


For Windows Vista or later, run cmd.exe as an administrator, and enter


  bcdedit /set IncreaseUserVa 3072


and restart the computer. To disable the switch, enter

  bcdedit /deletevalue IncreaseUserVa