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The pneumatic compressor (I believe it's [partlink:x191c01]) can be used with a motor to produce a continuous stream of air for as long as your batteries last.

You'd still need to find a way to either move the hose or direct air through different paths - as was shown in the points question, linear actuators could be used to move the hoses with precision, however they may not be fast enough to play the harmonica:

However, if you are looking for a more manual process you could use [partlink:4694b] Pneumatic Switch which allows you to direct air flow through one or other of the two holes, with air being provided to the lower, central input.

The pneumatic compressor (I believe it's [partlink:x191c01]) can be used with a motor to produce a continuous stream of air for as long as your batteries last.

You'd still need to find a way to either move the hose or direct air through different paths - as was shown in the points question, linear actuators could be used to move the hoses with precision, however they may not be fast enough to play the harmonica:

However, if you are looking for a more manual process you could use [partlink:4694b] Pneumatic Switch which allows you to direct air flow through one or other of the two holes, with air being provided to the lower, central input.

The pneumatic compressor (I believe it's [partlink:x191c01]) can be used with a motor to produce a continuous stream of air for as long as your batteries last.

You'd still need to find a way to either move the hose or direct air through different paths - as was shown in the points question, linear actuators could be used to move the hoses with precision, however they may not be fast enough to play the harmonica:

The pneumatic compressor (I believe it's [partlink:x191c01]) can be used with a motor to produce a continuous stream of air for as long as your batteries last.

You'd still need to find a way to either move the hose or direct air through different paths - as was shown in the points question, linear actuators could be used to move the hoses with precision, however they may not be fast enough to play the harmonica:

However, if you are looking for a more manual process you could use [partlink:4694b] Pneumatic Switch which allows you to direct air flow through one or other of the two holes, with air being provided to the lower, central input.

The pneumatic compressor (I believe it's [partlink:x191c01]) can be used with a motor to produce a continuous stream of air for as long as your batteries last.

You'd still need to find a way to either move the hose or direct air through different paths - as was shown in the points question, linear actuators could be used to move the hoses with precision, however they may not be fast enough to play the harmonica.

The pneumatic compressor (I believe it's [partlink:x191c01]) can be used with a motor to produce a continuous stream of air for as long as your batteries last.

You'd still need to find a way to either move the hose or direct air through different paths - as was shown in the points question, linear actuators could be used to move the hoses with precision, however they may not be fast enough to play the harmonica: