Troubleshooting guide

Creating a Configuration
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P4800 System Processor Software Guide Page 23 of 108
DSP Usage Meters
These meters, located at the bottom of the main window, indicate the amount of DSP resources and
delay memory utilized by the current configuration. Knowing the amount of DSP resources and delay
memory you have left enables you to manage your processor choices efficiently. When you add or
remove a processor block from the signal flow diagram the DSP meter instantly compiles the results,
and indicates the system resources that are being utilized by the current processor configuration.
Note: The DSP usage meter indicates the percentage of total resources the preset is
occupying, not than the amount of resources the processors consume individually.
Because the P4800 performs DSP with multiple processor chips, the DSP meter may not accurately
represent the amount of available resources. If the meter indicates 20% is available, but you can't add a
processor, it may be because the available resources are divided between the processor chips, rather than
being available in one place. Refer to the DSP Optimization Hints paragraph below for some solutions.
Note: P4800 units with a serial number starting with the letter N or higher will allow you
to story any scene that you can create in Design Mode. For older units (indicated
by a serial number starting with L or M) scenes that use less than 87%, as
indicated by the DSP meter should be usable. However, because resources are
allocated across multiple processor chips, the meter may not precisely represent
available DSP capacity. It is possible than an older unit may not be able to use a
scene even if the DSP meter reads less than 87%. This may happen if your
scene uses multiple DFR5, DFR10, and/or GEQ30 blocks. To ensure that a
scene will be usable on a P4800 with a serial number starting with L or M, you
should connect to the unit and go to Live Mode. In Live Mode, the DSP meter
and processor usage percentages listed in the Processor Toolbox will be scaled
to accurately reflect the capacity of the unit.
DSP Optimization Hints
If the message box shown in figure 13 appears when you
attempt to add a processor, optimize your configuration to free
up DSP resources, then add the processor. The following hints
will help you optimize DSP resources.
§ Move processor blocks from one side of the matrix mixer
to the other, beginning with the ones that consume the
highest percentage of DSP resources (see Appendix B:
DSP Usage Per Processor on page 102 for details on
processor DSP usage).
Example: move a DFR10 from the output side of the
signal flow diagram to the input side, or vise versa.
§ Consolidate multiple EQs on the same signal path into a single module, if possible.
Example: two PEQ3s consume more DSP than a PEQ7. Note that all PEQ's are available
with cut and shelf filters in order to conserve DSP. The only feature specific to the
CUT/SHELF module is the 24dB/oct slope. If you don't require this feature, it is not
necessary to include cut and shelf filters in a separate module on the same signal path.
§ Consolidate multiple delays on the same signal path into a single module, if possible.
Using two DLY5ms blocks to achieve 7 ms of delay uses twice as much DSP than a
single DLY150ms block, even though it conserves Delay memory.
Figure 13 − DSP Resources Message