Use cubic hermite interpolation for all playback (including overdubbing)

[rconstanzo]

Currently using linear interpolation for playback while overdubbing to avoid "1 sample behind the playhead" bleed, causing an aliasing sound while recording. Switch to the cubic hermite interpolation for all playback by avoiding the play and record heads being near each other.

[steadykammer]

this is mainly done in version 1.5, but need to test overdubbing.
higher order interpolations for record (ipoke style etc) will not happen until version 2.0

[rconstanzo]

Commit 3c6098d implements this and appears to be working. But there is still a bit of an issue when going to/from overdub at slower speeds. This may be "working as intended" though, given that record doesn't have fancy pants interpolation.

Steps to reproduce:
Create a loop and set speed to something low (0.1), then fill the buffer with vibes-a1.aif. Set overdub param to 0.0. Then send record messages to go into and out of overdub mode.

Actual results:
When playback is normal, interpolation sounds smooth. The moment you go into overdub mode, the playback of the vibes sounds interpolate-y.

Expected results:
It should sound the same.

*it may be worth closing this issue and raising a separate one that deals with overdub specifically, to declutter things.

[steadykammer]

yes definitely - it is a different issue…

…

On 8 Dec 2017, at 11:37, Rodrigo Constanzo ***@***.***> wrote: *it may be worth closing this issue and raising a separate one that deals with overdub specifically, to declutter things.

[rconstanzo]

Closing this one since issue #39 will take over from here.

Fixed in commit 3c6098d.