Sound overlapping cause stop of previous one

Builder
,
1

OS (e.g. Win10): Win10
PsychoPy version (e.g. 1.84.x): 2023.2.3
Standard Standalone? (y/n) If not then what?: y

Hello, I am designing an experiment that presents sounds using PsychoPy 2023.2.3 and the PTB sound library.
I am performing the task of recognizing a heartbeat and playing a sound with a certain delay using the following code:

if oximeter.serial.inWaiting() >= 5:
    paquet = list(oximeter.serial.read(5))
    if oximeter.check(paquet):  # Data consistency
        oximeter.add_paquet(paquet[2])  # Add new data point
        if oximeter.peaks[-1] == 1 :
            oximeter.channels["Channel_0"][-1]=1
            
            print("peak!")
            now = ptb.GetSecs()
            tone.play(when=now+1.5)

The upper part receives a specific trigger from the oximeter (I am using the systole package), and when an actual heartbeat is detected, it tries to play a tone (tone = sound.Sound(value=440, secs=0.2) defined in begin experiment) 1.5 seconds later.

However, if a new trigger occurs within 1.5 seconds, the delayed tone is not played, and the following error message occurs:

PsychPortAudio-WARNING: ‘Start’ method on audiodevice 1 called, although playback on device not yet completely stopped.
Will forcefully restart with possible audible artifacts or timing glitches.
Check your playback timing or use the ‘Stop’ function properly!

I want to play two or more sounds in parallel or overlapping, but if you have any advice, I would appreciate it.