Nice Piccys. Is the loco fitted with a Massoth pulse wheel sensor ?
Playing with CVs can become a hobby in its self. I like tinkering with sounds - getting the brake squeal to come in at the right moment takes a while but satisfying when done. A bit annoying that manufacturers increasingly seem to be hiding the variables. Your not supposed to 'think', just spend money and use what we give you!To get the sound more closely synchronised with the start, I tinkered with CV194 (trigger threshold for sound - digital), the starting voltage (CV2) and the acceleration time (CV3). It's easier if you've already reduced the top speed (CV5) to something realistic (>100) and suitably adjusted the mid speed (CV6) to around 30, to compliment the new top speed value (I run my locos 28 speed-steps, which. if that's your preference, should also be set in advance).
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You might want to try a ZIMO decoder then, you can adjust pretty much any decoder characteristic. This morning I've been changing CVs to synchronise 'chuffs' without a pulse generator on my Fieldbahn loco. Just about to make the whistles ( station staff and loco) playable by changing a couple of settingsPlaying with CVs can become a hobby in its self. I like tinkering with sounds - getting the brake squeal to come in at the right moment takes a while but satisfying when done. A bit annoying that manufacturers increasingly seem to be hiding the variables. Your not supposed to 'think', just spend money and use what we give you!