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Allpass filters are linear and time invariant
which means they commute with other linear and time invariant elements
- At least one sample of pure delay must normally be
``pulled out'' of ideal desired allpass along each rail
- Ideal allpass design minimizes phase-delay error
- Minimizing
approximately minimizes tuning error for modes of
freely vibrating string (main audible effect)
- Minimizing group delay error optimizes decay times
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