Rongs/Rongs examples broken?

[defaultxr]

Describe the bug
Rongs does not seem to generate audio as I would expect.

To Reproduce
Examples from Rongs' documentation:

(
Ndef(\c, {|pan=0.0, trigfreq=4|
    var trig = Dust2.kr(trigfreq);

    var sig = Rongs.ar(
        trig, 
        sustain: trig, 
        f0: [1.0,1.01] * TRand.kr(0.01,0.2, trig), 
        structure: TRand.kr(0.0,0.99,trig),
        brightness: TRand.kr(0.6,0.99,trig), 
        stretch: TRand.kr(0.1,0.99,trig), 
        damping: 0.7,
        //damping: TRand.kr(0.5,0.85, trig),
        accent: 0.99,
        loss: 0.1
    );

    Splay.ar(LeakDC.ar(sig), spread: 0.25, center: pan);
}).play;
)

(
SynthDef.new(\rongsinator, {|out, amp=0.25, pan=0, sustainTime=0.01, f0=0.05, structure=0.5, brightness=0.5, damping=0.75, accent=0.9, harmonicstretch=0.5, position=0.15, loss=0.15|
    var trig = Trig.kr(1, dur: sustainTime);

    var modeNum=2, cosFreq=0.025;
    var sig = Rongs.ar(
        trigger:trig, 
        sustain:trig, 
        f0:f0, 
        structure:structure, 
        brightness:brightness, 
        damping:damping, 
        accent:accent, 
        stretch:harmonicstretch, 
        position:position, 
        loss:loss, 
        modeNum:modeNum, 
        cosFreq:cosFreq
    );

    DetectSilence.ar(in: sig, amp: 0.0001, time: 0.1, doneAction: 2);
    sig = Pan2.ar(sig, pan);
    Out.ar(out, sig);
}).add;
)

// Trig it once
Synth(\rongsinator, [\damping, 0.5])

Neither of these seem to output any (or very quiet) audio for me. Even using Normalizer.ar doesn't give much in the way of any actual tones as I would expect. I can't get much out of it when playing around with the code either.

Expected behavior
Audio along the lines of Mutable Instruments Rings or similar.

Additional context
Using portedplugins v0.4.1 on SuperCollider 3.13.0 on Arch Linux.