And speaking of Zulu, from kitplanes.com:

LightSPEED Aviation's newest ANR headset, the Zulu, introduced at
AirVenture 2007, with the first sets shipping in September
2007. Featuring Bluetooth connectivity between the headset and your
cellphone, MP3 player or other compatible devices, LightSPEED has
integrated current (and convenient) technology with the headset's
aviation-specific features. It's drawn a natural comparison with
Bose's Headset X, however, at $850, it's priced about $150 below the
Bose price point.

We caught up with Allan Schrader, president of LightSPEED Aviation, at
the LightSPEED booth (Hangar D) to talk about the headset's review
featured in the April 2008 issue of sister publication Aviation
Consumer. He told us the headsets that were reviewed were produced
about 2000 sets prior to the headsets that are currently
available. Schrader adds that two of the issues--noise gating and music
muting--identified in that review had been brought to LightSPEED's
attention in advance of the review, and were corrected in February.

Music muting is the process that brings the volume of the music down
when an overriding signal such as an ATC call or in-cockpit
conversation is made. Testers had observed that when the voice signal
is weak, it would not mute the music sufficiently (for instance, if
you're monitoring ATIS 30 miles out). The threshold was lowered to
eliminate that issue; the music is now muted about 80%, so low you'd
hardly notice it. After the voice signal has stopped, the Zulu will
bring the music back up over five seconds. Schrader adds that this
feature is selectable so that a backseat passenger can rock out to
Chris Daughtry's latest without the continual interruption from ATC.
--
Once all struggle is grasped, miracles are possible.
~ Mao Tse Tung