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.
Blues players can also play a tritone in this position by bending the 4 draw. See a more extensive discussion of this position at the article on blues harp. On a diatonic, starting note is hole 2 draw or hole 3 blow. On a C-chromatic, starting hole is hole 3 blow, resulting in G major with a flatted 7th.