RP2040 using Arduino IDE

[HobmanX]

I am using a RP2040 board programming with Arduino IDE and trying your SimpleTone example.
I get it to work but the volume or as it is called amplitude values are not changing the volume of sound out. If I set it to 0 it mutes the sound and if I set it to any number higher it starts the sound at more or less same volume no matter what value..??
Also I2Swrite seems to write to both L&R even if only called once. Yet sketch say 1 write for Left and 2 writes for L&R.
If I do .........
I2Swrite(sample);
I2Swrite(0);
It writes the sample value to Left and a Zero value to Right.
Also doing only 1 write gives me a octave higher pitch than 2 writes....??? so pitch is dependant on waht else is running in loop
Also the pitch / frequency of sound out depends on the sample rate and not just on the the frequency variable setting.
Wondering is there a solution to this or a workaround etc.
this is link to the sketch....
https://github.com/earlephilhower/arduino-pico/blob/master/libraries/I2S/examples/SimpleTone/SimpleTone.ino