Gerd Dowids Mack approach trainer for trumpet. Not suitable for Breslmair mouthpieces. The "Mack" is an approach trainer for an optimal control of the air flow. It is a development from BERP and has all the advantages...'
Gerd Dowids Mack approach trainer for trumpet. Not suitable for Breslmair mouthpieces. The "Mack" is an approach trainer for an optimal control of the air flow. It is a development from BERP and has all the advantages...'
Gerd Dowids Mack approach trainer for trumpet. Not suitable for Breslmair mouthpieces. The "Mack" is an approach trainer for an optimal control of the air flow. It is a development from BERP and has all the advantages...'
Gerd Dowids Mack approach trainer for trumpet. Not suitable for Breslmair mouthpieces. The "Mack" is an approach trainer for an optimal control of the air flow. It is a development from BERP and has all the advantages...'
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