Financial ratios are relationships determined from a company's financial information and used for comparison purposes. Examples include such often referred to measures as return on investment (ROI), return on assets (ROA), and debt-to-equity, to name just three.
Tremolo harmonica. Tremolo harmonicas are a type of harmonica, distinct by having two reeds per note. In a tremolo harmonica the two reeds are tuned slightly off a reference pitch, one slightly sharp and the other slightly flat. This gives a unique wavering or warbling sound created by the two reeds being not exactly in tune with each other and difference in their subsequent waveforms acting against one another.
How to hold harmonica [edit]. For all harmonicas, the lower number should be on your left. If your harmonica does not have numbering system (usually in the case of East Asia Tremolo), the lowest note should be on your left. 1  Diatonic. 2  Hold the body of the harmonica in the left hand between the thumb and index finger. 3  The three remaining fingers will then be curved slightly, to form a small resonating space.