Final Notes

• Mass reflectance uses a warped, unaliased frequency axis (due to the bilinear transform) -- can be viewed as a ``Wave Digital Filter'' (WDF) mass model
• Delay lines use an unwarped, aliased frequency axis (simple sampling) -- ``digital waveguide model''
• Frequency axes align well at low frequencies, or given sufficient oversampling
• Mass model is 1st-order in both analog and digital domains
• A higher order digital filter can be used for the mass to improve frequency response across the audio band