1:yes there is indeed !
2:and not, its not about latency issues, is where the start sample position placed in the individual samples.
when i open the same accordion presets in H5 i see the "problem"in the sample editor.
all accordion samples start with some silence or the very first quiet note of the accordion when played in natural relaxed playing with no super fast attack to it.
anyway its impossible to play fast phrases and trills with it and hear the fast attacked and full sound( or playback cuz its not latency issue)
( its like trying to play Paganini storm violin part with slow synth pad 
)
so instead of making a complete new accordion samples with real playing fast attack, i request a simple move to add some fast attack accordion presets by moving the start point of the samples to full amplitude.