First think I was read your brief is a sound wave and a pen. And I make it in my mood board as well. After few hours of mood boarding, so I digitalize that. And I decided to add blue aqua colour to this logo because this colour mean the water in the river, always flowing through the river. Wish your company going like that. And I also make this sound wave have twelve curve, isn't lucky but it means balance and precision of your work and your client would appreciate it. And this monogram can combine with your logo text, I can't add in your logo right now but it will be optional.