Recommendations to sync music (Piano tiles)

Hi everyone!

I started a project to recreate piano tiles but I've been having a hard time with the timing and sync.

Using "Every X seconds" doesn't sync correctly and eventually the music (audio file) starts to lose the synchronization.

As a first solution, I've started using the "Wallclocktime" and compare it within itself.

This is what I have for sync so far:

[Variables]

ClockTimeRec = 0 - Number variable used to temporarily store wallclocktime

TickBPM = 0.5 - Number variable for beats (currently 0.5 for 120bpm whic is 60(secs)/120(beats))

On start of layout - Set ClockTimeRec to wallclocktime

Then I compared it back with wallclocktime:

[ClockTimeRec <= (wallclocktime - TickBPM)] - Trigger my event and set ClockTimeRec to wallclocktime

After this it will wait the amount of time on TickBPM and trigger again

This solution is working so much better but I feel like there can be a mayor improvement to this method, I'll appreciate any help to improve this and anything else in general that might help me with this rythm game.

Update01:

I've uploaded a synced version; cbucher.itch.io/construct3-rythmtest01

After a moment, the synchronization seems to be great.

However, I am getting some very specific lag spikes after a while causing some notes to overlap.

1. What could be causing them?

2. Should I avoid constantly using wallclocktime?