how do you delete instruments?

hi
i just bought an ipad 4, notion and all the instruments
i have to say; the program is buggy as hell but im happy with the parts of the application that are working so ill put the annoyances to one side for now.
one thing: i've added an instrument - specifically a 'voice' to my palette of instruments and now i want to delete it. I can make it invisible but how on earth do i delete it from my piece completely? i thought clicking on the right facing arrow would bring up an option to do this but it only provides transposition options and the opportunity to switch the instrument. I would expect a little red cross next to the right facing arrow next to the instrument name itself....i'm a software engineer also so im sorry if this annoys the devs....
many thanks
i just bought an ipad 4, notion and all the instruments
i have to say; the program is buggy as hell but im happy with the parts of the application that are working so ill put the annoyances to one side for now.
one thing: i've added an instrument - specifically a 'voice' to my palette of instruments and now i want to delete it. I can make it invisible but how on earth do i delete it from my piece completely? i thought clicking on the right facing arrow would bring up an option to do this but it only provides transposition options and the opportunity to switch the instrument. I would expect a little red cross next to the right facing arrow next to the instrument name itself....i'm a software engineer also so im sorry if this annoys the devs....
many thanks