Can I transfer only rhythm or pitch between two audio ？

[niu0717]

For example，source audio===>P( mel(i) |T(s), S(s), P(s), R(s), Zmel(s) ; θ) & target audio===>P( mel(i) |T(t), S(t), P(t), R(t), Zmel(t) ; θ), how can i just replace S or P of source to target with mellotron. Finally, generate this audio，P( mel(i) |T(s), S(t), P(s), R(s), Zmel(s) ; θ) or P( mel(i) |T(s), S(t), P(t), R(s), Zmel(s) ; θ) .
Thx!