Different number of staves

[Petr Felzmann]

Hello,

I have the song such that have 4 voices in 4 staves for the strophe. But
the refrain have 3 voices in 2 staves.

The second song have a solo voice. But somewhere are vocal voices (like
"aaa", "hmm").

Can I make this two songs by M-Tx or will I must write this songs in PMX
or MusiXTeX?

Thank You,

Petr Felzmann.