Zapping between channel with many audio tracks

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Hi,

Now, I try to write a plugin, in this plugin I want to switch channel
and I use :
> cChannel *Channel =  Channels.GetByNumber(Number);
> if (Channel) {
>    cDevice::PrimaryDevice()->SwitchChannel(Channel, true);
> }

It works perfectly with common channels, but when I have two channels
with multiple audio tracks, like these:

> MOSA 2:12324:vC34:S19.2E
:27500:163:1921=fra,1922=fra,1923=fra,1924=fra,1925=fra,1926=fra,1927=fra,1928=fra,1929=fra,1930=fra,1931=fra,1932=fra,1933=fra,1934=fra,1935=fra,1936=fra,1937=fra,1938=fra,1939=fra,1940=fra:0:0:8604:1:1096:0
> MOSA 3:12324:vC34:S19.2E
:27500:164:1941=fra,1942=fra,1943=fra,1944=fra,1945=fra,1946=fra,1947=fra,1948=fra,1949=fra,1950=fra,1951=fra,1952=fra,1953=fra,1954=fra,1955=fra,1956=fra,1957=fra,1958=fra,1959=fra,1960=fra:0:0:8605:1:1096:0
> MOSA 4:12324:vC34:S19.2E
:27500:166:1961=fra,1962=fra,1963=fra,1964=fra,1965=fra,1966=fra,1967=fra,1968=fra,1969=fra,1970=fra,1971=fra,1972=fra,1973=fra,1974=fra,1975=fra,1976=fra,1977=fra,1978=fra,1979=fra,1981=fra:0:0:8614:1:1096:0

Vdr switch the channel, but it still black screen (no audio, no video).

When I zap using the channel menu, I have the same result.
MOSA 2 -> MOSA 3 = Black
MOSA 2 -> An Other Channel -> MOSA 3 = OK
MOSA 2 -> MOSA 3 -> MOSA 4 = MOSA 3 Black then MOSA 4 OK

I would know if there is a solution to switch directly between these
channels.
Perhaps a solution like this:

1) Switch to MOSA 2
2) Switch to MOSA 3:
     2 a) " "Unload" MOSA 2 audio tracks"
     2 b) Switch channel to MOSA 3

Have you got any ideas ?
What can I do ?

Thanks
BR,

Nouche
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