Great app but needs more features. – Audiobel: Professional SPL Review

I love this app and use it for the simple tasks that it provides. But I do think it needs more features revolving around audio. The features I think you should add are: spectrogram. Now this being one thing that I would like to see is just something that I would use a lot.
Review by CritiqueMemester on Audiobel: Professional SPL.