Weird effect of Strymon Zuma powering Orange Kongpressor (which doubles voltage internally)


If I engage the compressor it makes a loud 'roaring' sound into the amp - this is on the 9V Zuma out, but through a Pedal Power 2 no issue. The Kongpressor according to Orange :

'Internal Charge Pump
Like all Orange pedals, the Kongpressor features an internal charge pump which doubles the operating voltage of the pedal to 18V. This has the effect of drastically increasing the headroom for super clean compression. The Kongpressor can be powered by 9V battery or standard DC adapter, or for even more output can also run on 12V DC.'

Anyone got any ideas why this might have happened? Pedal sounds fine hope it hasn't fried anything or weakened it any way

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