You can use your LFOs as mod envelopes. See page 83 "Envelope mode" of the TI1 manual.
The LFO effectively becomes an additional Envelope.
LFOs in Envelope Mode are unipolar (see glossary) and stop
after completing exactly one cycle. The start/finish point
within the wave can be specified via Trigger Phase...
I find it extremly clumsy but hey, it works most times.
However, if somebody is able to recreate the Sylenth1 factory preset "dominator" on a Virus I'd be very happy for a quick note.