Score .sort problem?

I'm getting a strange error with .sort on a Score. I hope I'm not misunderstanding the syntax of the .add method.

If have have the following:

(
x = [

[0.0, [\b_allocRead, 0, "/scsound/blackman.wav"]],
[0.0, [\b_allocRead, 1, "/scsound/blackmanHarris.wav"]],
[0.0, [\b_allocRead, 2, "/scsound/nuttall.wav"]],
[0.0, [\b_allocRead, 3, "/scsound/sinc.wav"]],
[0.0, [\b_allocRead, 4, "/Users/Scott/Compositions/PercElec/OperaGongs/cogong3-7.wav"]],
[0.0, [\b_allocRead, 5, "/Users/Scott/Compositions/PercElec/Bongos/bongo4-1.wav"]],
[0.0, [\b_allocRead, 6, "/Users/Scott/Compositions/PercElec/Bongos/bongo3-1.wav"]],
[0.0, [\b_allocRead, 7, "/Users/Scott/Compositions/PercElec/Bongos/bongo4-2.wav"]]

]
)

(
a =     Pbind(
    \instrument, \fileGran,
    \sndbuf, 4,
    \windowbuf, 2,
    \freq, Pseq([\rest, Pwhite(1,1)]),
    \delta, Pseq([1, Pwhite(0.005, 0.01, 730)]),
    \beg, Env([1000, 10000], [5]),
    \end, Pkey(\beg) + Env([100, 10000], [5]),
    \pan, Env([-1, 0.5, -0.5, 0.2, 1, 0], [5, 5, 5, 5, 6]),
    \trans, 1.8,
    \db, Env([-60, 0, -80], [3, 3])
    );
)


d = a.asScore(7.5);
d.add(x);
d.sort;


The d.sort throws this error:


ERROR: Message '>=' not understood.
RECEIVER:
   nil
ARGS:
   Integer 0
CALL STACK:
    DoesNotUnderstandError:reportError   061B3430
        arg this = <instance of DoesNotUnderstandError>
    Nil:handleError   064A3810
        arg this = nil
        arg error = <instance of DoesNotUnderstandError>
    Thread:handleError   064A3D50
        arg this = <instance of Thread>
        arg error = <instance of DoesNotUnderstandError>
    Object:throw   064A4470
        arg this = <instance of DoesNotUnderstandError>
    Object:doesNotUnderstand   064A47D0
        arg this = nil
        arg selector = '>='
        arg args = [*1]
    < FunctionDef in Method Collection:collectAs >   064A5370
        arg elem = "/scsound/blackman.wav"
        arg i = 2
    ArrayedCollection:do   064A57F0
        arg this = [*3]
        arg function = <instance of Function>
        var i = 2
    Collection:collectAs   06528990
        arg this = [*3]
        arg function = <instance of Function>
        arg class = class Array
        var res = [*2]
    < FunctionDef in Method Collection:collectAs >   064A5490
(there's more after this that I'm assuming isn't necessary to debug, but I can post if needed).


Thanks very much,
sw



--
Scott Worthington
stwbass@...
www.scottworthington.com