decodeInstrument in music.ts does not consider offset for amp and pitch LFO's amplitude

    function decodeInstrument(buf: Uint8Array, offset: number): Instrument {
        return {
            waveform: buf[offset],
            ampEnvelope: {
                attack: get16BitNumber(buf, offset + 1),
                decay: get16BitNumber(buf, offset + 3),
                sustain: get16BitNumber(buf, offset + 5),
                release: get16BitNumber(buf, offset + 7),
                amplitude: get16BitNumber(buf, offset + 9),
            },
            pitchEnvelope: {
                attack: get16BitNumber(buf, offset + 11),
                decay: get16BitNumber(buf, offset + 13),
                sustain: get16BitNumber(buf, offset + 15),
                release: get16BitNumber(buf, offset + 17),
                amplitude: get16BitNumber(buf, offset + 19),
            },
            ampLFO: {
                frequency: buf[offset + 21],
                amplitude: get16BitNumber(buf, 22)  // here
            },
            pitchLFO: {
                frequency: buf[offset + 24],
                amplitude: get16BitNumber(buf, 25)  // here
            },
            octave: buf[offset + 27]
        }
    }

They appear that they should be get16BitNumber(buf, offset + 22) and get16BitNumber(buf, offset + 25) similar to the LFO frequencies and envelopes and waveform.

Open pxtlib/music.ts and inspect decodeInstrument, focusing on the ampLFO and pitchLFO amplitude reads identified in the issue. Compare them with the surrounding offset-based envelope and frequency reads; done means both LFO amplitudes are decoded relative to the supplied offset.