SmoothWavetable

[giuliomoro]

SmoothWavetable
that makes all necessary assumptions for linear interpolation (and test they are true in the create() function):

• table size is 2^n + 1
• ASSERT(table[2^n] == table[0])

[giuliomoro]

7d8bade in the wavetable branch.

This provides linear interpolation which is a huge improvement over Wavetable, which truncates the index (does not even do rounding)

[giuliomoro]

Added SmoothWavetable4 9e2d503 which uses 4-point polynomial interpolation (same as PureData tabread4~)

[giuliomoro]

Also note that the current table size is limited to 2^15 by the fact that the accumulator is a 32bit signed, and 16bits are reserved for the fractional part. This is a const in the class and can be changed, potentially according to the actual table length.