The volume pedals can go last, after the tuner or in the middle of the board. Typically though they are based at the end of the chain, but it is down to preference. I think they should go last because it allows you to change the volume after all of the harmonics and tones have been affected. The delay pedals are ideal for playing around with the sound output. Putting it before the fuzz and distortion could mess up the pitch and spoil the purpose of the delayed effect. Volume pedals such as delay and reverb can be adjusted using a single pedal, individual pedals or from the amplifier. I tend to use the amp’s reverb setting to give a fuller, richer sound.