[iPhone] Full duplex AudioQueue - is it supported?

In other words - is it possible to playback some sound and to record something at the same time? Somewhere like a karaoke effect.
Using the modified SpeakHere sample code, but the playback stops when starting a record session there. Is this feature supported at the hardware level?

thanks for reply!
yeap - the actual iPhone device. I've found an interesting URL, where some guys have finally managed to get the full duplex:
http://touchmods.blog.com/
(search the "there is also a simultaneous playback-record function available")
but no sources or any comments present. What kind of magic did they use? But surfing the relative pages there, I've found out, they apply various hacks on theirs way(like using back-engineered Celestial.h etc). Is there a non-hack way to get the goal, I wonder.

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    System returned to ROM by power-on
    System image file is "flash:/c2960s-universalk9-mz.122-53.SE2/c2960s-universalk9-mz.122-53.SE2.bin"
    This product contains cryptographic features and is subject to United
    States and local country laws governing import, export, transfer and
    use. Delivery of Cisco cryptographic products does not imply
    third-party authority to import, export, distribute or use encryption.
    Importers, exporters, distributors and users are responsible for
    compliance with U.S. and local country laws. By using this product you
    agree to comply with applicable laws and regulations. If you are unable
    to comply with U.S. and local laws, return this product immediately.
    A summary of U.S. laws governing Cisco cryptographic products may be found at:
    http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
    If you require further assistance please contact us by sending email to
    [email protected].
    cisco WS-C2960S-24TS-L (PowerPC) processor (revision B0) with 131072K bytes of memory.
    Processor board ID FOC1435W6KX
    Last reset from power-on
    4 Virtual Ethernet interfaces
    1 FastEthernet interface
    28 Gigabit Ethernet interfaces
    The password-recovery mechanism is enabled.
    512K bytes of flash-simulated non-volatile configuration memory.
    Base ethernet MAC Address       : AC:A0:16:F3:EF:00
    Motherboard assembly number     : 73-11910-06
    Power supply part number        : 341-0328-01
    Motherboard serial number       : FOC14354WTE
    Power supply serial number      : LIT142210AX
    Model revision number           : B0
    Motherboard revision number     : A0
    Model number                    : WS-C2960S-24TS-L
    Daughterboard assembly number   : 73-11933-04
    Daughterboard serial number     : FOC1435437G
    System serial number            : FOC1435W6KX
    Top Assembly Part Number        : 800-30954-02
    Top Assembly Revision Number    : A0
    Version ID                      : V02
    CLEI Code Number                : COMGG00ARB
    Daughterboard revision number   : A0
    Hardware Board Revision Number  : 0x01
    Switch Ports Model              SW Version            SW Image
    *    1 28    WS-C2960S-24TS-L   12.2(53)SE2           C2960S-UNIVERSALK9-M
    Configuration register is 0xF
    MSTswitchOVCC#

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