Trigger SP by ext. LFO

Hi,
I’m trying to trigger the SP via CV Gate in by the square LFO provided by a Dark Energy. As I increase the Frequency of the LFO to a certain amount, the notes of the SP don’t get faster, but rather uncontinoous and it eventually stops. I set attack and release to zero. It appears like the Slim Phatty cant handle too many gate inputs. I use this routing in software synths all the time and it works fine. Analog triggering should be even more accurate and immediate. Am I missing on something here?
Thanks