It is planned that the spectral envelope library is ported to the Apple Macintosh system, allowing the integration of spectral envelope manipulation in the DIPHONE program. This will be in the form of an extension of the additive synthesis plugin, such that the manipulations of spectral envelopes that are possible with the library, will be controlled by the intuitive graphical user interface of DIPHONE.
What's more, spectral envelopes allow for the convenient modeling and manipulation of the residual noise, which could be made accessible to the additive synthesis plugin of DIPHONE, and to the CHANT plugin.
With the interpolation capabilities between precise formants and spectral envelopes with marked formant regions (fuzzy formants, see section 5.1.2), it is even possible to bridge the gap between the two synthesis methods, and to interface the excellent generation of vowels in CHANT with the flexibility of ADDITIVE in DIPHONE.