Yes. Firmware V1.3 and higher support wide sample rate deviation.
This is enabled via the Pro Tools Setup Hardware Analog Out Channel 5 function.
When set to A, Narrow mode is enabled. When set to B, Wide mode is enabled.
Narrow allows +/-0.5% variation at all MADI channel counts.
Wide allows +/-4.2% varispeed in 56 MADI channel mode only.
Please note that the Delta-Link firmware updater is only tested on 32-bit Windows XP. It may not work in 64-bit or later versions. Firmware is available here.
For more information on Delta-Link configuration via Pro Tools Hardware menu, see the Delta-Link manual.