Proper import of modules in Colab

Question

i have a question regarding the proper way to import modules in colab. I used the folder structure from "6.4.Packages" in https://docs.python.org/3/tutorial/modules.html:

sounds/  
    __init__.py
    effects/
        __init__.py
        echo.py  
            def echo_func(arg):
              return something
        surround.py
            def surround_func(arg):
              return somehing

The files are located in path/to/sounds on my google.drive account, and i'm mounting my drive via:

from google.colab import drive  
drive.mount(mount_path)

import sys
sys.path.insert(0, path/to/sounds)

The problem that i have now is, that i want to import the modules in this way

import sounds.effects as se
echo_func = se.echo.echo_func(arg)

---------
AttributeError: module 'sounds.effects' has no attribute 'echo'
---------

A workaround at the moment is:

import sounds.effects.echo
import sounds.effects as se

echo_func = se.echo.echo_func(arg)

So if i import sounds.effects.echo first, i can import sounds.effects and the module echo in se.echo is found. The same goes for surrounds:

import sounds.effects.surround
import sounds.effects as se

surround_func = se.surround.surround_func(arg)

Is there a way, that this double-import-workaround is not needed? I haven't found any working solution for this problem yet,
thanks in advance