I have Plug and Play Tuner on gb quad plus work here directly? Demodulator: STV0913
Serit NIM Sp2246
Tuner: STV6111
Most probably the tuner is capable of Multistream!
But I guess the drivers are provided from Gigablue and it doesn't use the kernel driver.
If the driver has the capability of FE_CAN_MULTISTREAM then most probably you are ready to rock. You can use command dvb-fe-tool -f X to check frontend capabilities.
If the driver doesn't have the capability of FE_CAN_MULTISTREAM then you need to ask GigaBlue to enable FE_CAN_MULTISTREAM.