May ID Core 10 ako dati and found the same "problem" that you have regarding sustain that cuts out.
Apparently, hindi sya problem talaga. Naka "on" lang by default yung built in noise gate nung amp. You need to download the Blackstar Insider software then connect niyo yung amp sa PC then turn off the noise gate via the software.
Ok rin kasi ang daming tone shaping na possible via the software tapos save na lang sa amp as presets.
Awww,,,
Kaya pla pakiramdam ko nga may noise gate,,
heheh un pla un,,
anyway free ba ung Insider ?
dko pa kasi natry idownload sa website,,
and parang wala akong nakitang option to download,,
thanx sa explanation sir,,,
now i know...